Bowls England:	Buckinghamshire Bowls	English Bowls Umpires Association
English Indoor Bowls Association	English Short Mat Bowls Association	Bucks Short Mat

You could also check out:
Bowls Club.org:"The largest searchable directory  of  lawn bowls, crown green, indoor bowls, short mat and carpet bowls clubs"

.Bowlsclub.info - another searchable list of clubs around the world. 
Books on Bowls