Are you still using thymol in spirit, John? I saw that in action and the bees really disliked it. Also not compatible with the honey flow that's about to overwhelm us :).
Amitraz is now approved for the UK but the Spanish company with the registration hasn't started selling yet as far as I know. Look out for Apitraz 500 (I think) next year. Until then Apivar is prescription only via Ark Vets unless you are in the BFA or know a friendly vet yourself.