Louise,
I was in the same position as yourself a few years ago, I eventually went private and had the same surgeon that I would have had on the NHS only 9 months earlier! The TOTAL cost of my LR and TTT (including all physio and follow up appointments, injections, medications etc) came to about £4,000, but I did have to have an extra op to remove the screw a few months later so for a straightforward one I reckon you're looking at about £3,000-£3500 (that was with BUPA). Don't know if different companies charge different prices, or if the price has gone up since mine. Might be worth phoning them to see if they can give you an idea of what it will cost. I reckon private healthcare is very beneficial especially when you look at waiting times on the NHS, if you can afford it I would definately take it out, I found that your follow-up appointments are so much better and quicker and a lot less impersonal than the NHS, just my experience though.
Natalie.