Suspect abuser, don't know what to do

[aviation]

Tricky and sensitive one. Some guy I met a couple of times many years ago has moved into my local area. I recently mentioned this to a friend, I said I had seen him about. My friend then told me that she heard he sexually abused his own son. He never got 'officially' accused, (that I know of, I don't think the son even accused him of it, but I really don't know much about the guy) but through circles of friends it seems to be widely known that he did do this horrible deed.
I have seen him walking around the area holding hands with a very young girl (about 8 yrs old) that evidently is his landladys daughter, who he looks after.

I would hate to think he could be abusing this girl and I might have been able to stop it/alerted the mother. But what can I do? I could be way off the mark. I don't know where he lives or anything about him.

Before I knew all this I never liked the guy, he is very creepy so it makes me think its entirely possible he could do something like this.

Also, he could be completely innocent - I don't know the people who apparently 'witnessed' the abuse - its through friends of friends. But, for all I know, it could be a rumour made up by someone who hated him for some other reason. Sick I know.

What to do?
(I've name changed for this one)

Really dont bother ringing NSPCC they will just pass on the info to SS's, you may as well ring SS first
NSPCC dont go out and do that sort of thing, they are too busy making fancy adverts!

Sixtyfootdoll, they won't pass anything on to SS unless you agree to it - they can't. If they want to pass it on they have to ask if you mind and then the will ask you for your details. The main reason for ringing them here is to ask advice - which is exactly what they are good at, giving you ideas where to go next. SS being one of the possible options. The NSPCC will probably not approach the mother though, that is beyond their remit really.

Not because I want to start a row with you, just for people who come across this thread later.

There isn't a public register as such, but a friendly copper could probably check 'on the quiet' if you ask nicely.

However, convictions are public record and are normally reported, so Google may well come up trumps....