Tomatoes looking sick

[petefj]

Three out of six tomato plants are looking very limp and almost looking on the point of collapse.
They are in an unheated conservatory along with other plants none of which are showing similar signs.

I know this is not a brilliant description, but what should i be looking for here?

Thanks,

Peter

[petefj]

[goodlife]

Wet compost? Night time temperatures have not been much at all and cooler the weather..less water the plants will need. I've got some plants is pots in my unheated GH...and they get barely watered..just enough to keep them alive. They don't look sad..but neither they are much growing..but if I were to increase my watering now, I'm sure they would keel over and die.

[green lily]

Cold will turn them purple like  mine... Limp, if not a watering problem do they just need staking? Otherwise dig one up and see if something is eating the roots. Slugs and snails hide everywhere... ::) But more tomatoes die of trench foot than most other causes.....