Neighbour has since he's lived in his flat been using BT WiFi (free) FOn? - with a username and password left by previous tenants. This has now stopped working, and he's been moaning about it - and is now starting to badger me about me giving him the password to mine - not offering to pay towards it or anything.
AIBU to say no? It's not the fastest as it is, and someone else streaming films/downloading films (which he says is "all he wants it for" will slow it down even more.