Yes it's a scam, we have had them in the past and partner has bought some of their things (we didn't realise it was a scam at the time).

You've alerted the SNT which is the right thing to do, other than that keep an eye on any elderly or vulnerable neighbours you may know - we once intervened when we saw a scammer hassling an elderly neighbour.

Thanks for letting people know on here as well - we will be on the look out!