Postscript.
Last Wednesday, 23rd June, I was able to present the model to John Fennings, son of the pilot, Eric Fennings, who flew PF510 on Operations.
The photo below, taken outside the Aviator hotel, on Sywell aerodrome, near Northampton, UK, shows John ( on left ) with the model, and a very relieved me, happy that he was overjoyed with this surprise present from Max.