Leave, leave, leave! Wait until it's red. It won't ripen if it's green.
thought as much, but my partner stuck her noise in and said to pick it, what does she know.
Once it starts to colour up and go yellow or orange, you can pick it and ripen it indoors if you like, but if it's green, it will probably just stay green.
When is the right time to pick tomatoes? I've read that you can leave them too long on the vine, but I'm not sure why. Does the flavour deteriorate after they turn red or start rotting or something?
How long after they've turned proper red should you pick them, and should you pull them off the vine or cut the whole truss in one go and leave them connected, like vine tomatoes in the supermarket?