The attached photo shows part of the Farnborough dump in 1957. The L.H. nose is a Viking prototype (VW218) but the aircraft on the trestle looks like a Dak as do other odd bits. Note Swift as well (WK194) at RH side.
I can’t remember now who it was logged the two Dakotas as being at Farnborough that year unfortunately but, as you say, KN510 had a heavy landing out east long before then,
Jim