The past couple of years, I have been working hard to try and secure a better spread of vegetables through the year on the allotment. I have been using a makeshift cold frame - an old floor-board, 8 galvanised nails and an old window from the house next door to the allotment site - to grow lettuces. We have kept the window slightly open except in coldest weather so that the air doesn't get stangant. I am experimenting with a few different varieties, but this week we had a 'Valdor' with chives and salad burnet, also from allotment. Not the best lettuce I've ever tasted, but enough for two people. I will report further on other varieties. Maybe other people have got suggestions?