Phone advice

My BT phone bill this month was over £50 - with no calls made, just line rental and internet. Admittedly it's fast internet, but I think the price is getting a bit silly. I've resisted changing phone company until now because I didn't want to change my number, but I'm beginning to think I ought to bite the bullet if there's a better option.

Any recommendations for an alternative in the London area? I want phone and internet, not really interested in extra TV channels etc.