Sender appears to be using Yahoo, ie the first "received from" is smtp112.mail.ir2.yahoo.com although the given reply address is at sky.com (I think someone told me that yahoo is the underlying service for sky customers).
Thanks for the offer of another email address, I use the free version of Mailwasher which can only check one mail server address so would prefer to stick with what I have.
I could have him add my gmail or yahoo webmail addresses to his outgoing list at risk of compounding the issue!
I think I might just try sending myself stuff from the two webmail options first, to see what that shows.
Ta,
Rans6.....