URL, Subdomain and Root Domain Structure

[Mark_Ch]

Various URL Structure
mydomain.co.uk
www.mydomain.co.uk
http://www.mydomain.co.uk
http://mydomain.co.uk
mydomain.co.uk/index.html
www.mydomain.co.uk/index.html
http://www.mydomain.co.uk/index.html
http://mydomain.co.uk/index.html

HTACCESS File

Index Rewrite

RewriteRule ^index.(htm|html|php) http://www.mydomain.co.uk/ [R=301,L]
  RewriteRule ^(.)/index.(htm|html|php) http://www.mydomain.co.uk/$1/ [R=301,L]
RewriteCond %{HTTP_HOST} ^mydomain.co.uk
RewriteRule ^(.)$ http://www.mydomain.co.uk/$1 [R=301,L]

Google WMT Setting: Configuration | Settings
Preferred domain: radio check on "don't set a preferred domain"

SEOMoz Open Site Explorer
mydomain.co.uk - (301 Redirect) [No Data]    PA38  DA30
http://www.mydomain.co.uk/index.html - (301 Redirect) [No Data]    PA23  DA30

Majestic Site Explorer
Number of Referring Domains & External Backlinks vary between the following instances:
URL:                    http://www.mydomain.co.uk
SUBDOMAIN:     www.mydomain.co.uk
ROOT DOMAIN: mydomain.co.uk
Question
I have set up my htaccess file to rewrite "Various URL Structure" to www.mydomain.co.uk. However when i view metrics in Majestic SEO, the url / Subdomain / Root Domain all differ.

Why is this happening?
Is this harming my site?
What is common practice when defining URL Structure?

Any other quality advise and implementation structure would be much appreciated.

Regards

Mark

[Tom-Anthony]

Hi Mark,

I've taken a look at your domain in both OSE and Majestic, and don't see anything untoward. I've checked all your 301s and it looks all configured correctly to me.

I see a very very slight difference in the sub-domain and root-domain numbers, which isn't unusual and which I see quite often.

I don't think you have anything to worry about!

[Mark_Ch]

Hi Tom,

Thank you for you help & support.

Regards

Mark