It goes back further than that. The Ferranti family home was Kerfield House near Knutsford. Sebastian J Z De Ferranti was an early helicopter user with a Brantley B2A. The Company had the Westland Widgeon and a Bell 47 as mentioned.
See this entry from "Flight" in 1967
www.flightglobal.com
The helipad at Kerfield house featured a hangar with a retractable landing pad - very James Bond.......