Oh Gosh, I am bowing down to all this superior knowledge. But I have sowed my Big Boy toms as I thought they needed a longer growing season. The seedlings have popped up but I'll have to leave them in the propogator for the time being. Then, perhaps I'll bring them in. I have been looking at the jumbo propagator. Its huge (47 x 19 ins), almost 20 ins high and with a variable temparature so I might splash out (again!) and get one of those. I figure it must be cheaper using one of these than heating the whole greenhouse. Doesn't resolve the light issue though.
Jools