Thanks Primrose
I shall certainly give one of them a go. Nearly every year I have a go at something different. Last year it was sweetcorn. But unfortunatly the frons at the top shed their polen before the cobs were ready for them. Probably a problem with it being too hot. The porch faces South East, and gets the sun all day. Also have tried peas. They grew very well, but never made it to the pot (far too tasty

).
Also because I have 2 small boys (5 and 2) I like to change it every year (with the exception of toms

), so they have something they can look after on the rainy/windy days.