Sowing for Autumn/Winter Harvests

Every time I consider growing in the gh over winter, I'm disappointed. The frosts kill anything tender I grow and if I put something like chard in the borders they only seem to take off in spring when I want to clear the space for putting up staging/sowing/planting. I have some beans and carrots sown in MFBs just to extend the season and I may sow some chard in pots to see how they produce, but you need and awful lot of pots of chard to get a few meals out of them. The upshot is.... I don't bother.