Here in the UK, I have just been logged out of my BBC ID and I logged back in with postcode.
Did it, initially, on my Windows phone and was then asked to log out and in again on Windows PC and iPad, but, using same ID, postcode had been stored, so did not have to re-input. Not sure if there is a limit on number of phones/tablets/PCs that can be used with any one BBC ID.
It seems that anyone (maybe in the UK), who knows my log in, can use any BBC services.