Good old 'ttttrrrrrembbbbbllllllllling ttttttttwo'. I was on 33 but 230 took delivery of XW 222. When it arrived it had a peculiar vibration that gave it it's name. These were before the days of Chadwick and suchlike and they could never find the reason. It used to have to fly around on 14 degrees pitch to make it bearable. The boss wanted the aircraft declared a rogue and be sent off to fester in an MU but those days had gone. It fell out of the conversations eventually so I suppose they sorted out something.
I haven't got my log books with me but I think I picked up 231 from the factory. Westlands had lots of forms to fill in and after that I saw a Stationary Office lined book that appeared to be a temporary F700. The first entry was for 0:05 mins.. 'Severe vibration in Hover.' / 'Main rotors, MRG .and tail rotor transmission changed'. It had a further 3 hours and then I flew it to an MU where it was Xmas treed for spares. It came on to 33 later when we had bent a few.