Are there any breeders in the uk?  My family is looking for a new member and we have fallen in love with this breed.  We already have two terriers, westi, and a yorkshire cross cairn. 
Please email me at laurajoycoltman@aol.com
Thankyou

There aren't large numbers, but there are 3 breed clubs, which would be your best source for a reputable breeder.

http://www.thedogscene.co.uk/breedinfo/a-b/boston/#clubs