
Make a start with the one on this site, I can verify their status but it could be a start also contact the breed club.
http://www.champdogs.co.uk/breeds/lancashire-heeler/puppies[url=]www.thelancashireheelerclub.co.uk [/url]
According to the club their show is on the 6th May and that would be a good place to start is you are looking for a 'show' type if you are looking for a working one then I am not sure where you would start but the breed club no doubt would.