I would contact Customs authorities in your area, ask them about Cameron, it may be they can find something out.

Perhaps Saudi Arabia has regulations about where they will accept animals being imported from?

London's Airports are Heathrow and Gatwick, they are both huge. I doubt you could find out anything on the telephone.

I think your best alternative right now is the police/diplomatic authorities. They should be able to at least trace this person through his ISP and find out the truth. If you paid him by credit card, call the credit card company and explain to hold payment for now.