I had an interesting conversation with a contact at Bing today to see where they are up to with things. It seems their presence in the UK is ever growing. From 10% it has now gone up to 18% as of September which is nearly a 90% increase in there search strength. I made the call as to see the effect of Paid search as from a ranking perspective we’ve still seen relatively similar results for what live and MSN search used to display.
One thing is sure we need to keep a keen eye on this market share as if it keeps increasing it will change the face of the internet marketing industry. I mean when’s the last time you carried out SEO for someone who said their main concern was ranking in a search engine that wasn’t Google.
We’ll just have to keep a keen eye and ourears to the ground.
Neil Walker is the founder of SEO at Just Search Ltd who rank on the 1st page of Google UK for "SEO". He has over 7 years experience and dealt with over 2500 clients SEO over the years. He has only started to proactively blog in the past 4 months by running "SEO Mad" - He hopes you find it interesting. 
After speaking with the PPC department at Just Search I found further information about Bing from a UK perspective. Bing has only really been soft launched in the UK but actually had a massive marketing budget in the US. We believe that a substantial marketing budget will be spent in the UK in 2010.
They lied to me, I feel cheated after my discussion with Microsoft Adcentre I’ve been reading RSS feeds and watching the News and it appears that the market share is more likely 10% as appose to 18%, Keep trying Bing