Received the quote from JLC with regards servicing my Master Ultra thin, along with a list of things they say needs doing, which is quite a long.
So for everything done the cost is £598 plus 20% VAT which comes to £717.60, therefore because of JLC's recommendations I've decided to go for that full service.
I also got a quote for a JLC SS bracelet for that model which was/is £1160, so I'll just have the service for now, although because I very much like the look of that bracelet, I may have one fitted when I've the spare money.
With the expense of that bracelet though, will mean I won't bother getting a JLC reverso, or at least for quite sometime.