I came across these photographs on ebay, and purchased them. They are of Matilda II T6909 "Greenock" of the 7th RTR. The photo says the tank is abandoned in Dunkirk, certainly on the beach front, looking at the sand everyhwere. Of interest is the diagonally striped circle on the rear left of the turret. It looks like the 2 Pdr has been spiked, judging by the messy barrel end.
The white BEF recognition squares are visible on the hull side. Also take note of the raised suspension, subsequently lowered for action in North Africa.
These have got me messing around with the Matilda II master again.