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You can go this route easily enough, it just requires a deliberate decision as to which is public and which is behind your login-wall. Put a different way, you're going to need some public pages that explain your site, how the process works, etc. Once you've established what is necessary from a user and SEO perspective, then you can wall off your content behind a login.

You also need to experiment some with your funnel. If you present your wall on the first page after the home page, is that going to drive conversions (registrations in this case) up or down? Maybe your users are reading 3-4 pages before registering. Where is the sweet spot? A-B test. Funnel test. Be careful that you don't go "Hey, registrations increased sales so we need everyone to register!" because you might hurt sales down the road if less people register.

You won't get a referrer. Googlebot is not like a real user, surfing from site to site. What Googlebot does is this (more or less)

1. Googlebot requests a standalone page
2. Googlebot parses the page out. During this process it notes the links on that page and, depending on various mechanisms (nofollow, internal page rank, the mood of Matt Cutts, etc) it will note those links for the system to parse later
3. Googlebot is done so it grabs another page off the page list (likely without know how it got on said list) and goes back to #1

Now, to your question. Since Googlebot has no referrer it won't get your alternate content. This means that your alternate content page won't get indexed.

I would suggest here that a best practice is NOT to filter on referrer data, which can be inconsistent and potentially fake. Instead, I would make a separate page that contains your extra data and allow users to decide if they want more information Thus Googlebot finds all your content and your users get a better experience.

Google really isn't all that concerned with the structure of your URLs. You could have domain.com/widgets/nfdi23ur2r255.rofl and they wouldn't care. Having a keyword in your URL is nice but not necessary.

My advice is to pick URLs that are easier to remember. So domain.com/widgets/brown is not cleaner per se, but it is easier to remember.

It looks like you have some NS problems according to IntoDNS. The largest issue is that you have 4 nameservers listed with your registrar but only 2 are listed in your DNS.

~]$ dig NS yoactive.co.uk
;; ANSWER SECTION:
yoactive.co.uk.         86400   IN      NS      ns2.ccgdigitalmarketing.com.
yoactive.co.uk.         86400   IN      NS      ns1.ccgdigitalmarketing.com.

You should have a NS record for each DNS server. Also, your SOA is set to expire in... 5 weeks?! That's crazy long.

If you can't get this resolved with your host, you can always try CloudFlare, a free DNS + proxy service.

First and foremost, you need to understand (or perhaps your CEO as well) that SEO is really a subset of marketing. Seriously, go watch some Whiteboard Fridays and you'll find them talking about marketing in pretty much every one.

Now that we're all on the same page about marketing... what your boss is asking for isn't impossible but very difficult and very much underpaid and overworked. 50 sites and 30 brands... really? For one person? That means each brand is getting, at most, one day of your time. It's a recipe for disaster. But to answer the question...

First, organize the sites and brands. Group them together (spreadsheets can help with this). Try to group by categories and then associate brands with websites. Next, come up with a way to address these. In other words, you can only practically work on one site at any given time. So I would pick 5 sites and set up a Moz campaign for each. Let each run 2 weeks and then Archive them. Moz only allows you 5 active campaigns at a time. I don't know what, if any, limits there are on archived campaigns. Now, assess the 5 reports while you set 5 new ones up and let them run. Rinse and repeat.

Now, for actions, you need to have a list for each website. Again, spreadsheets help here. Document what you do, when you did it and why. Then use Moz to keep tabs on what happens as a result. This will be painfully slow but if they don't want to give you the tools necessary it's the best you can do. If you do get an assistant you can use these reports and lists to delegate things for them to do.

Last but not least, sit down with the CEO and hammer out expectations. What does this CEO want? Does he want you to just make suggestions or is he expecting you to implement them as well? What kind of authority do you have to make these changes? An SEO without authority to make changes is impotent and your job will eventually be called into question (corporations are notorious for mandating things without conveying the associated authority to accomplish them). Try to work with this person to ensure that you know what they want and what you intend to do to get that result.

So... two sites that send paid traffic are apparently sending you paid traffic but you're not paying for it. The only way i could see this being a problem is if they are overwhelming your site (i.e. your site is slow because of the traffic volume).

Blocking traffic from a given source isn't a simple matter. Not all browsers report a referrer and, without that, you can't really do anything about it. You could geoblock requests if you suspect the links are all coming from the same region but even that isn't a perfect solution (it relies on data that is not necessarily reliable). Ultimately I wouldn't try to block traffic coming to your site because it's a potential source of conversions. Just too much headache for not any real gain.

One major tip I always point people to is that using protocol-less links for anything external is a great way to make sure your site always supports SSL without issue.

Firebug is a great way to make sure everything is loading HTTPS. Turn it on, switch to the Net tab, and load your page. It will show you every request sent as part of your page. It makes spotting non-SSL requests easy.

You can turn HSTS on yourself if your provider uses Apache and supports htaccess. (sorry I can't link an article, Moz won't let me). If they don't, you will have to have your host enable it on their end.

We have a registered trademark. I've not seen any problems with either. The only potential problem I could see would be in using the raw character instead of the HTML entity () and you're not using UTF8 on your site it's possible that it could appear garbled in some contexts.

I'm not sure what context you're using this in but this should do the trick (works with PCRE)

^http://www.mysite.com(?:/|)(?:[D,d]efault.aspx|)$

Links can help with geotargeting. Getting UK links sends a strong localization signal. Just remember to build organic.

This is actually the preferred method to do it. Duplicate content is normally a problem but, between domain.com and domain.cctld (.co.uk in your case) it's not a problem. Google recognizes that ccTLDs exist to send localization signals and it should rank your ccTLD better for google.co.uk than your .com

Matt Cutts talked about this a while back.

You do not need a language declaration unless they are different (which I don't think UK qualifies vs a standard English site)

I would make sure each page specifies the language it's in. Google has an easy way for you to identify the language, either through a meta tag or sitemap.

It doesn't matter to Google. I don't think anyone issues on less than 2048 bits (your actual encryption will be 128 or 256 bits, depending on what your server and the client supports). As long as it's valid and signed properly it should be fine.

Public Service Announcement: Please opt for SHA2 (if asked) and make sure you don't have any heartbleed problems.

Hidden means the text will never be shown to an end user under any circumstances. It could be in a div with "display:none" as its style, or white text on a white background.

As long as the text isn't hidden it will be indexed properly. It doesn't matter how you display it on the screen.

The simple answer is they're using a generic TLD(gTLD) and then a county TLD(ccTLD). Google has long said that it recognizes that the same content on different ccTLDs will not count as duplicate because they understand it's geotargeted

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It's not a penalty per se, it just means that Google is going to pick one copy and devalue the others. Does it affect your ability to rank? Not really. It just means one site is going to be the winner. Remember, a penalty is where Google devalues your whole site for bad behavior. Duplicate content is not bad behavior.

If you want to pick the rankings winner yourself you can add a canonical tag to the other pages pointing to the one you want to rank.

ccTLDs are different from gTLDs (and .uk is also restricted to only UK businesses unlike .co.uk) in that they show a specific affinity for a country. Google recognizes this, as well as users.

The only SEO consideration is do you want to be seen as UK specific or more general? There's nothing from preventing you from doing either, but you do need to understand that signal is there with a ccTLD.

As far as buying yourdomain.uk and pointing it to yourdomain.co.uk there's no harm but no benefit either.

"Autocomplete engagement" sounds like a terrible name for a reality TV show.

Haven't heard of it. Considering that it's Google's best guess as to what you're typing, and it's based on what other users have searched, I wouldn't say it's impossible. But the catch is you need to know exactly what your users are typing in. Let's say you sell dialysis equipment. You would need to know if your users are searching "dialysis machine", vs "how do dialysis machines work" (and those represent two very different searches). You then need to rank well for that term.

The only thing I can assume is they're going to somehow flood Google with clicks on a term. Done hundreds, or even thousands of times, I could see it working to some extent. But any successes would be transient (this is the reason why mechanisms like Panda, Penguin and Hummingbird exist in the first place). As such, I place little stock in it.