From the other side of the pond, some ideas from when I used to grow them. You cannot give a tomato too much water unless you wash it out of the ground, and the water is only fed from low down. Compost should be laid between the plants and not touch the stalk. The roots will find it when its washed down. A feather on a stick can be used to `tickle` all the flowers to aid pollination. Outside plants, no more than five trusses, or the winter will be there before they ripe. Green tomatoes cropped before a frost will keep in a cool dark room if each are separated, any bad ones removed, and there should be some for Christmas. Green tomatoes can be used to make a nice Tomato Chutney.