Probably not quite what
BEAgle had in mind but in 1969/70 Westward Airways operated a shuttle to Gatwick with a BN Islander, shrinking to a Piper Cherokee in the final days
G-AXFC Britten-Norman BN-2A Islander of Westward Airways at the Gatwick General Aviation Terminal - 1970 - British Airlines of the Past - Some of the gone, but not forgotten airlines of Britain. - Caz Caswell's Aviation Photographs Web Site
From the heavier metal I suspect it will again be the DC-6B. The last bookable prop service into
Gatwick was a Balair DC-6B from Basle operating 6 days a week up to 1981. Source Propliner Magazine.