My son has turned 18 & got a letter with some instructions on what to do, however, this requires a prepaid envelope which was supposed to be with the letter but wasn’t.

Can anyone advise who/where to send it to?

the letter asks for specific ID plus the original letter to be included… no problem, however it does not say if we should also include a form or note to say how we want the money… cheque or transfer to another of his accounts. We’d also like advice on this.