Thanks for you input folks. It turned out, though, that i could in fact manage to squeeze 20 tomato plants, 3 big planters of spring onion, 2 sacks and a bin of tatties and 4 planters of carrots in a 8x6. Just can't fit much in the way of me in it though ;D
Will follow your advice Deb and hopefully I will have some movement space soon.
Not too sure about cutting them off if I can possibly help it, and I seem to be able to - with a contortionist performance when I go in.