So I spend several hours clearing and digging the plot in the heat.
Eventually decide I'm much too knackered to carry on so make for home.
Get to the allotment gates, unlock them, go through, close them behind me, lock them and go to get back in the car.
Only problem is that the car is still on the other side of the gate, door still open and engine still happily running.
D'OH :-[
(don't think anyone saw me ::))