Never been any history of green spinners been used. The 'standard' colours were either 'Sky' or 'Night' (black), depending on period and assignment. For example, from late 1943, those fighters assigned to 2 TAF had (officially) black spinners, whilst ADGB aircraft had 'Sky'. The guide lines for camouflage and incidental markings in the RAF (and Commonwealth air forces) were quite strict and, in general, were adhered to.
There were minor exceptions, mainly late in the war, where spinners might be painted in the 'Flight' colour, for example. 'A' Flight red, 'B' Flight mid blue, and even rarer examples of different locally mixed colours, such as Bob Cross's Spit, in the Far East, where mid green spinners were used to symbolise the 'Woodpeckers', and bright-coloured spinners on a Squadron Leader's Typhoon might be seen. But in the latter case, this was late on, with allied air superiority, and used as an instant recognition marking.
Bottom line, the Spits in this unit possibly had dark blue spinners (unlikely) or they had either red, or black spinners!