Well it's transferring an aircraft to GMC when on the active runway which isn't tickety boo with the runway incursion guidelines.It also doesn't fit phraseology that is allowed with fixed wing or helis.However we transfer helis to GMC when they are holding on 32 or 23 as standard practise,which are under Tower control.That point is just ignored because people want an easy life.I'm not sure what SRG/CAA would think of it because Aberdeen is a one off.Our Mats part 1 doesn't cover a lot of what happens with the helis and it's a grey area what's right and wrong.