Independent shops that rely on a central service for their prices. Although they start with the same prices they do manage their liability on an individual basis so you may find that one shop will cut a price whilst it is held elsewhere. See here for shop locations.
Some independents take bets online
Bookmakers Technology Consortium
The BTC share their website feeds… http://www.btc.uk.com/WhiteLabels.html
An up to date list of these can be found here http://www.btc.uk.com/members.html