Do the airlines in the UK desire aerobatics?
Not really.
However, what'll it do for your confidence and skills is incredible. Also, it may give you something to talk about in the interview. Especially if you continue to do aerobatic flying once you're flying professionally.
I don't do aerobatics, my husband used to do them in Australia. To be honest, the only flying I would entertain in the UK is something like aerobatics or floats. Doing xcountry flying would feel like work but a lot slower.
NetJets Europe sent their cadets on an aerobatic course.