There were researchers at the National AH conference in February (held in Warwick conveniently).
There is hope yet that they might be able to do just that and also further work on pheromone traps. That is why we should ‘hold them off for as long as possible. Because once they become established it will be very difficult and expensive to deal with. Defra and the NBU will then not be able to cope ( a bit like the NHS and C19) and it will be up to pest control and private means to deal with nests.