Suspected financial fraud

[acapulco]

Please can someone help! I have inadvertently found bank remittance advice showing that my husband (separated 8 years) has made many international money transfers - and still may be doing so - out of his South African bank account (SA has strict exchange control regulations) in the name of our son as a 'gift'. It appears this money has gone into my husband's UK bank account. My son did not even have a bank account for most of this time and certainly did not receive the money. This runs into quite a few thousand pounds. When I tried to call the UK bank concerned they could not discuss (data protection). So what do I do? I do not want my son - now 21 - to receive a backdated income tax bill on these stipulated funds, and I certainly do not want him to be seemingly complicit in facilitating this. My son is most shocked that his Father could do this to him.