There was a light aircraft park on the south side of Heathrow near to where Pan-Am cargo used to live. One Eric Raffles used to commute to Manchester on a daily basis in the 1960s using Raffles Zulu Charlie a Beech D95A Travel Air. Also remember the big piston pounders, Douglas DCs and Curtiss C-46s which I could see when walking the dog along the twin rivers.
Shell had 2 125s, think they were TPC and TPD