I thought Eric 'Winkle' Brown, who lists helicopters amongst types flown, had flown the flying bedstead, but can't find this on t'internet.
mechta,
I've just had a look at Appendix I of 'Wings on my Sleeve', which lists the 487(!) types that Winkle Brown flew and I don't see an entry under Flying Bedstead, Rolls Royce or Thrust Measuring Rig.