My toms (Moneymaker) here in Kent are in a greenhouse. Unfortunately I never got around to painting the windows with Coolglass whitener, so they suffered a bit in the sun. As a result, I've had to discard a few with blossom-end rot and split fruit, and one or two of the plants never reached their full height. However, a decent tomato crop overall and we started picking the red ones about a fortnight ago. At the moment there are still more green than red ones on the plants but this is fine as they'll be pickable for longer in the season. I've tried the banana trick on a couple of green toms that fell off the plant - they started reddening up the very next day so it obviously work.