Lee .... Brother Adam developed the Buckfast bee in England. You would expect that this bee would be commonly used in England ...... this is not so. It is easier to obtain other types of Queens ...... Italians, Carnies, Irish, Greeks ..........
Listening to the local grapevine, there can be problems with introduction of a new Queen of a different strain. If the Q is accepted, you can get the immediate result you required BUT there can be unexpected unwanted features. These features may take a generation or two to show up.
At present, the National Bee Unit and the British BKA are encouraging beekeepers to use local native strains and avoid imported stock.