First... what IS a British lab? Is it an import? Is it the off-spring of imports? Is there a certain % of the genetic material that has to be from "British" Labs? Is it a deliberate strategy by US breeders to exclude American/Canadian lines from a pedigree? Do "British" labs have a different conformation? ARe they less susceptible to, i.e., not carriers of hereditary maladies? (And if you narrow any gene pool... aren't you inviting a whole 'nother set of genetic problems?)
The labs I see on You Tube clips from UK FT's look lean and muscular about like the ones you see around here. And they were beautifully under control... but they were competing on a Championship level, so... I'd expect they would have been trained to excel at the sport the way the Brits play it.
Are there breeders in Great Britain who advertise "North American Labrador" puppies?
Are Golden Retriever breeders in the US smitten with "British" Goldens?
Does anyone in the UK have the stuff it would take to try the truly American Retriever... the Chessie.
But mostly... do "British Lab" owners in the US have a fondness for tweed and Wellies and send their dogs with the wrong hand?