Danny re yr. 10808:
"Another lovely pic ! So that was the one and only Griffon Tempest. Nice, clean lines, should fly very well. But what a weird, "stepped" leading edge. What would be the (aerodynamic) advantage of that, do you suppose "?
I think that it is a wing mounted oil cooler (in the closed position) as the Napier engine versions all had a huge air intake up front under the engine which this Griffon prototype does not. I think that the (Bristol)? radial engined Tempests also utilised this feature
All the best
Ian BB