it's just slightly deeper from front to back than I can reach with my fingertips so about 5', and about 8' wide.
it also came with lots of hibernating lacewings and ladybirds tucked up in the roof ;D
I've already moved in all the rubbish useful things that I've been saving up in the spare room: shelves, carrier bags full of empty 2 litre water bottles, bamboo canes, pots, an old table that I always knew would come in useful one day... just need to find a free/cheap chair and I'm all set!
thanks manics for the suggestions, I quite fancy a fig – will have a google and find out some more info. in the plan in my head, the slightly shady end of the plot where the shed is will be the bit reserved for "sitting and enjoying". OH said he might even come down if we can set up the old camping stove for tea :o