I doubt if that's necessarily a 'scam' (although it could be). I know that the National Apple Collection - Brogdale - will identify varieties of apple tree, by sending a sample, and they do charge, roughly that sort of fee.
I don't think a tree surgeon would have a clue. Surgeon is a misnomer, butcher would be more accurate.
Someone has already mentioned that the RHS can identify plants. Members only, so you'd have to join, but you wouldn't be wasting your money. They'd need a physical sample, or very good photos.
Have you exhausted all the free avenues of enquiry - for example, by carefully examining the leaves and shoots, and comparing them with the leaves and shoots of suspect trees.
Have not read any David Icke, though am aware of his history. He was a reporter on a local Coventry newspaper a long time ago, then went to the BBC, and subsequently became infamous - I wouldn't take any of his ideas seriously. If he's offering to tell you a secret, then it's not a secret, is it.