I tried to start the red one just now and it sounds like it really wants to start but then I tried it again and the dials flickered a bit and the dash board lights went out. When I put the key back to the ignition bit (without turning off the engine) they came back on again
That's a dead battery. All its power is being used to turn the engine, leaving nothing left to fire the ignition. Nick Mum's battery just to test.