I know nothing about the pipes, in fact I'm not even sure whether you mean bagpipes, pan pipes or some other sort of pipes

I assume they use notation rather than tab or something else...

Your neighbour might find one of the online sites helpful, eg
8notes.com There is probably much more theory there than he needs to learn at the moment, but perhaps you could tell him which lessons are the most important.
It's an American site so they talk about half-notes etc instead of minims etc but perhaps you could write him out the English equivalents. Not ideal I know, but it might help to get him going until he can get to somewhere like Banks and have a browse around to see what suits him.