When SHB arrives in UK it will probably be via a package of bees (with a health certificate or not). What will the NBU policy be when SHB is discovered in your apiary? It will be compulsory destruction of the whole apiary and treatment of the soil. Plus SHB can fly, so the chances are it will be all over the area very quickly. Is that what any amateur beekeeper wants? I cannot see how a commercial bee farmer could recover from that. It is a very different prospect from Foulbrood.
Do we really want to take that risk?