Tumbling tomatoes in pots undercover

In the past my tumbling tomatoes have always been in pots outdoors and whilst they've been reasonably productive I never needed to prune them.  This year  I've put the tubs in the GH and they're going berserk.   Do I need to prune, armpit or curtail them, apart from when they're trying to escape through the door, or do I leave them to their own devices?