Thanks everyone for your helpful input.
Cherrytree lots of very good info there - no I haven't had a proper diagnosis yet, only my GP saying yes it sounded like CT when I mentioned it last year. It wasn't bothering me much then so I didn't pursue it. Interesting about your DH and his elbow.
Scooter and GandT so good to read of your successful surgery, very reassuring.
Not so reassuring, though, is your experience Bluebelle. I'm relieved to see I don't live in your health authority area 
OK, doctor's appointment, get referral and get this thing sorted.