SRS - I'm right at the bottom end of North Yorkshire, and the Vale of York (ie - flat). Only about 30 feet above sea level.
I grew some Ruby Chard last year, but because of the nature of my vastly overplanted little plot it wasn't too successful. I thought I'd cleared it out, but nevertheless, one plant has grown this year. I have also put 3 Cape Gooseberry plants in (Physalis). The Tayberry looks like it's going to crop well this year, if only I can beat the birds to 'em.
My veg would do a lot better if I could demolish part of the big house next door, which shades it during the afternoon. But when your garden is an old foldyard, (not much depth of soil before rubble) and the house next door is the original farmhouse, you can't do much about it. My house celebrates its 100th birthday this year - it's Edwardian "in-filling", and replaces a barn which had to be pulled down. The whole plot, including house, is only about a fifth of an acre.