I always enjoy Alistair Sawday's site for individual hotels and B&Bs.

Otherwise, the AA (Automobile Association, not the 12-step people) website has an incredibly comprehensive search for B&Bs in the UK, together with the rosette system - a 5-rosette property has to reach incredibly high standards.

Good old tripadvisor has a good number of well-known B&Bs on it now, usual caveats apply.

Otherwise, have a search on some of the national newspapers' travel sites - I've found a number of gems from the Guardian Travel supplement recently.

Two personal recent favourites were Chequers at Wickham Market, in Suffolk - good base for the best of the county (Lavenham, Orford, Woodbridge, Aldeburgh, Thorpeness, Bury, Southwold...) and Incleborough House in Runton, North Norfolk, which again is a wonderful base to explore one of the best bits of the English coastline.

Didn't get to stay here as it was booked out, but I really liked the look of the Cley Mill further round the North Norfolk coast.