grahame54 - 9:47 am on Aug 15, 2006 (gmt 0)

A friend of mine has a website based in the UK which very recently ranked in the top 3 on google.com and on google.co.uk for the main industry search term.

Yesterday the website totally disappeared from the google.co.uk index although it is still ranked position 3 in the SERPS on google.com.

There have been no significant changes to the website, the site is purely whitehat (though it has a lot of rubbish javascript but nothing that I can see that would upset Google - for example there are no cloaked links or redirects) the site has plenty of quality content and it is not over-optimized. It is sitting on the same UK server with the same IP address as previously.

It is difficult to avoid the conclusion that the disappearance from the UK index is a result of a change in Google's algorithm or some other failure at Google's end.

My questions are:

1. Why has Google dropped the site from its UK index?
2. Is Google likely to drop the site from the google.com index?
3. What can we do to get it back in the uK index?

Anyone got any ideas?