UK Piano Page Piano Forum
Please read the Piano Forum FAQ for more details. Also, read the piano FAQ for common questions on pianos Please don't ask us to place a value on your piano as an on site inspection is required. Contact you local piano tuner who will be more than happy to help.
Recommendation is by far the best - ask friends/family/acquaintances who are learning or whose kids/friends are learning.
Don't be seduced by letters after the name - doesn't necessarily mean a good teacher, just a good musician; the two aren't synonymous.
Ask in the local music shop, if there is one, or ask your piano tuner - we tend to know (or know of) most local teachers.
Look in the Yellow Pages.