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Hi Charlene- It sounds like the pages that are delivering the 404 errors are not something you want to be crawled or indexed. Consider placing these pages in your robots.txt file or using rel noindex on them. Be careful listening to my advice at the moment. I haven't seen your content on the discussed pages, so you need to be 100% sure about what you are doing before changing anything.

There was a time when Google simply ignored so-called "stop words", for processing efficiency, and so they two queries in your example were essentially the same. It looks like that has changed over time, though. See this post from 2008 by Bill Slawski (an expert on Google patents and technology): http://www.seobythesea.com/2008/01/new-google-approach-to-indexing-and-stopwords/ ...and a quick experiment someone did in 2010 that seems to confirm that: http://www.dougwilliams.com/blog/seo/stop-words-does-google-ignore-these-anymore.php In my experience, it's a bit specific to the query and competition. In many cases, the addition or subtractions of a stop word may not make much of a difference, but in your case it probably does. If the term you want to target is "Holidays in Ireland" and the Top 10 for that term seems different from the shorter term, I'd say to use "in". I'm seeing some differences between those two sets of Top 10 results (not huge, but some).