I'm selling our old style Phil and Ted's double buggy for £55. It's well worn but otherwise in good condition. Unfortunately it is missing one small part which means you can't use it in the mode with the newborn underneath and the child seat on top. (you could possibly get this extra part from the manufacturers). But it works in the double buggy mode ie with the two seats for a toddler and older baby.
Message me if you have any questions. Photo attached (hopefully!)