Looking at this picture, it appears to be a squadron of Matilda IIs. The caption says 12 September 1941 near Tobruk. The online history of 4 and 7 R.T.R. states that 4 R.T.R. only arrived in the fortress at the end of September. This would then pretty conclusively point to this being ‘D’ Squadron 7 R.T.R, which would distinguish itself during the breakout two and a half months later.
Anyone recognise one of the tankers?
Matilda tanks lined up and ready to move off near Tobruk, 12 September 1941. Courtesy IWM Picture Collection