Tearing my eyes away from that gorgeous Hiller(!), the two HCC Mk 8s (XN126&127)were a crab response to Prince Phillip flying the Navy Whirlwinds ....they couldn't have that ....and were relatively short lived,both being converted to stock Mk10s once the HCCMk 12s were delivered.One of the latter was lost in a fatal crash between Benson and Yeovil when the main rotor shaft failed due to corrosion.The survivor is in the Helicopter Museum