I only got one response when I made the same request last year and without guaranteeing the number I wished to buy without knowing the price, I got no further. I gave the seller two options but he refused to proceed on that basis.
The tyres on some Green Goddess from memory are branded as Avon but many were also fitted with Bar Grips. All are now extremely rare and all British 15 cwts, 3 tonners and Ferrets etc will eventually end up on Bar Grips at some stage. Quite if anyone will ever be able to persuade Simex to use the Dunlop Moulds they have seems unlikely. Lots of people have tried. We need a millionaire to make them an offer they cannot refuse.