...It was a manure bed that I was thinking personally, for the heat, then trailing them up around the polytunnel frame... I love the idea of the old pineapple pits (which relied on heat, rather than sun), so that was my take on them in a more practical sense (plus I'd rather have fresh fruit than chocolate any day of the week). Not sure where abouts you are pgkevet, but I'll be very interested to know how you get on.