This list features the top 4 leading search engines based on UK Internet usage, ranked by volume of searches for the 4 weeks ending January 26, 2008.

Rank Search Engine Volume
1. google.co.uk 74.11%
2. google.com 14.11%
3. uk.ask.com 3.05%
4. uk.search.yahoo.com 2.18%
Source - Hitwise - January, 2008 - based on volume of searches.
I was very surprised by the fact that ASK is growing faster in the UK than Yahoo. To be fair to Yahoo though, ASK have recently had a marketing campaign running on TV so I would imagine that has helped them leap frog over Yahoo.
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The new advertising campaign for ask has been quite eye catching, seems to be aimed directly at google users too, good tactics, obviously its paying off!
google very good search engine & user friendly also