Morning OP was thinking about you. (((Hugs)))
Survivors UK has a very good reputation, speak to them yourself first and ask for advice if DH feels unable to do this.
I am not sure of the other site and can't get the link to work .....but I have blocks on my computer so it could well be that.
There is at least another site in the UK but tbh I found it dodgy..one person very iffy band running it. I will leave it there....careful though.
Stick with NAPAC and SurvivorsUK is my advice. They might be able to signpost you more locally.
Ring Survivors or NAPAC yourself and ask initial advice and how best for you to support him. Tiny steps on this one.
Your DH has locked this all away for so long now, he has taken a huge step finally in confiding in you. This horrible stuff takes a long time to get through and a lot of dealing with it is based on trust. Lots to be thinking about.... Is the abuser still alive for example? (don't need to answer just something to think of). These organisations will believe him, he will not be made to feel a liar, they will listen. they will not reveal his information to anyone.... or insist that he goes to the Police. Neither will they judge him or say "why didn't you tell anyone"? They have heard a lot of terrible things. Whatever it is ... it can be told to these people confidentially. Without pressure.
Ultimately, what to do is up to him though.
He might not feel up to looking at the sites at the moment as they may trigger all sorts of things off for him, so try not to insist he speaks to them. Nothing was his fault, he was a child, remember this. Whatever he may think.
You are doing great to support him, he must love you and trust you so much.
The first time I told anyone as an adult (not DH) I cried and cried. A mixture of shame, anger and relief and sadness for the child I was. It was a great release though after it being locked away so long. But we are all different so I can only speak for myself there.
Hope you are all as ok as possible on here and willing you all through this to better times. x