Even more pedantically, the dripping tap at the end of Alan's Psychedelic Breakfast (on AHM, as has been noted!) was only a locked groove on the early pressings. Echoes on Meddle doesn't / didn't have a locked groove, though it is a fantastic track and this fact shouldn't stop anyone rushing out to buy a copy of the gatefold Japanese pressing (which I'm currently trying to find in mint condition myself!)