Posted: 21/03/2016 at 09:16
One word of warning - I wouldn't put tomatoes close to potatoes. They are the same family and both are prone to the same blight, so if one gets blight then the other is likely to.
I put perpetual spinach with beetroot and lettuces last year and they did well. That soil had been manured in the autumn.
Plant the sweet corn in a block, not a row, it makes fertilisation easier.