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.
Google Algorithm QDF ?
Does Google change their algorithms to artificially promote new pages?
Hard to say but there is evidence that QDF exists.
A new look MoreUK
Today we launched .
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!