Sasless.....actually the Westminster used a dynamic system based on the experimental Sikorsky S-60, which itself was developed from the earlier S-56 Mojave with big outrigger radial piston engines. Westland installed two Eland turbines and built up the airframe as a testbed.Later the principle went back across the Atlantic to emerge as the S-64 Skycrane.
Two Westminsters were built and both were scrapped ,ending up as tie rods under a concrete platform at an industrial site in a village near Yeovil!
I see the Rotodyne in the background of the picture.......