Today I was out and needed to pee - ok actually I had needed to pee before I went out, but I decided I'd wait until I was out somewhere before peeing.   I was in the vicintity of some flats.  These flats have an access door at the end of the block, then to the other side they have a bin store and some little outdoor storage rooms - brick built with doors and mostly padlocked.  I presume each flat has one and it is probably for keeping things like bikes, tools etc., or anything they don't want in