If they can't shut this down in ~2 hours, MOD/IC signals services should be fired. You can go for kinetic kills against the drone (shotgun if low, something more expensive if it's larger/higher), but should be able to find/fix/finish the transmitter fairly easily with equipment I'd hope national-level police would have, but certainly could get from the military (along with operators) in something of this severity.
Plus the full range of commercial anti-drone companies, some of which are based in Europe (a couple in UK I think).
Plus the full range of commercial anti-drone companies, some of which are based in Europe (a couple in UK I think).