There are a few price comparison sitesThe most useful one I found was Simply Switch. You insert your postcode and your requirements.
For technical information on the different providers/ISPs go to adslguide.org.uk.
I won’t recommend any company as prices & specifications change all the time. (This site does not have sponsored click throughs & blanket recommendations!)
Although if you’ve got 2 PCs, Wanadoo’s £17.99 Wirless & Talk offer is currently good value. If readers have any suggestions or comments please click on the comments icon.