Absolutely a scam. Looks like the "new Nigeria" is the UK. Although I have checked out a couple of emails supposedly from the UK, and they turned out to be from the Netherlands. I have my email account set up to always reveal the IP address of incoming. You can go to this site and track the IP address.
http://arul.telenet-systems.com/track.html
If they are lying about location, then it's probably a scam.
Contact Frank and see if the high bidder came through. He is a good guy to work with and very knowledgeable.
Lynn