I would be very wary about accepting any cash above say a grand as money laundering (unwittingly) is a serious offence in it's own right. You have no traceability with cash which you could be challenged over !
I use a separate account for incoming money transfers that has a minimal amount of £1-17 in at all other times, as soon as the transfer is in I shift it to our "normal" current account so it acts as a quarantine in effect and at zero cost to me, it is in my name only unlike all our other accounts so herself is totally protected from any potential fallout.
The OP post is a classic scam.
