44% of UK residents do!
The Google Ads blog is a good resource of stats and insights into mobile. The most recent post, Think Mobile UK: Ian Carrington of Google calls for “A little less conversation, a little more action”, details some interesting stats:
He also outlines four simple steps for integrating mobile:
You can watch Ian's talk here (be aware - it goes for alomst half an hour!!).
And remember, always ask: "Where's the data?"!