Very funny you two jokers....I missed that irony when I posted. Was thinking maybe there are other sites like Preloved that I dont know about...obvs not Gumtree.
Also have few years of World of Interiors mags I'd like to sell, is there an interior design outlet for them?
Would it be worth talking to your local auction house? They could give you an idea of what sort of money your Lot might fetch and you can then decide if you want them to sell it for you, with a decent Reserve on it of course.
If its English, Collectable, anything to do with the royal Family then ETSY. Depending on how much you have that could be a challenge photographing everything and writing descriptions, not to mention the postage costs etc. If you have a substantial amount and its good quality good name then I would approach a local auction house.