So the six speed is £390 all-in, with the new sump, oil and labour and VAT. The eight speed is a little bit more expensive, I think they meant £20 or £40 more but not much. They recommended it was done at 100 K, as a bit of an unwritten rule because they are meant to be scared for life.
I have the dreaded cam belt change next year, I may ask them to do the gearbox at the same time as the car will probably be in mid 90,000 miles by then