Now I can't confirm this myself but I was just browsing Reddit and came across a couple tips that may be handy to our members from the UK. Apparently most locked dumpsters can be opened with a triangle key like this. The same thread also mentioned that there's a key called a RADAR key that opens most public toilets. This can also be purchased easily online. If anyone has experience with these, please let us know! Otherwise, use this information at your own risk.