To ripen Tomatoes, cover them with a Fleece at night. We recommend feeding your Tomato Plants with Gro-Sure Concentrated Tomato Food, this encourages early-flowering, ripening and cropping and makes around 50 litres of fertilisers.
If the weather turns chilly, cut off the entire vine and hang it in a Greenhouse to continue to allow the tomatoes to ripen.
Alternatively, harvest any unripe fruit and place in brown paper bags to slowly ripen. To speed up this process, pop a ripe banana into the bag. The ethylene gases contained in bananas will cause the tomatoes to ripen rapidly.