Thanks, I've come to the conclusion it's someone within the trade, the nasty threats have also come just after a propective client got funny with me. H only ever secure bookings in person over the phone and he left it until within the final week - didn't call yest but emailed again to say he had made travel arrangements.
I don't know if I'm being over handed but I only ever take the first secured booking for a particular day - that means voice call. I offered him a different slot that would also fit in with his schedule -but he made it clear he wouldn't want me to drive so far so late. Funny since I've driven into the middle of Cumbria late at night no problems.
Perhaps I'm paranoid, perhaps not. I'm taking a break right now and will only be seeing regulars when I return.