Blast! I was worrying that might be the case. So, for the future - I'm also intersted in how much sterilising we're talking about here. Everything's in pots or growbags so soil contamination shouldn't be a problem. They're on a patio so I suppose that could be cleaned in advance of any attempt next year (though I might stick to the beans and courgettes as they've been more successful). I've got a pepper and chilli plant in the same vicinity that I was thinking of overwintering, they seem to be OK at the moment, but are they vulnerable?

As for the plants alive at the moment, is it reasoable to leave the higher tomatoes on the plant in the hope they'll ripen before succumbing to the infection or should I really take off what I can and use them for a green tomato chutney? Speaking of which, I'm assuming ones that look OK are safe to eat...