I would understand change of clutch and DMF in diesel at this mileage, but not in 2.2JTS (unless previous owner in some way abused it).
In terms of gearbox updates, up to you to spend a fortune, but I wouldn't do that much.
I was driving with noisy bearing for 90kkm/5years before I had sorted it out, I only replaced oil (the old one was full of metallic micro-fractions according to mechanics) and added some nano-ceramics additive, and I believe it completely stopped progress on the issue, so it was possible to do that 90kkm (or even more, there were no signs of getting worse etc, and oil was clean after years). But finally I decided to sort it out. The cost of 6 timken bearings was ~EUR130, 3L of Tutela oil (I put 2.8L as a lot of people recommend for M32 0.5L extra for better lubrification) EUR35, labour (it was cheap, as one of polish forum member mechanics did the work for me and didn't charged me at full rate, rather half) EUR120. I understand that you need to go with UK labour rates and pay to garage not somebody who charges you at lower rate, but still maybe way lower money spend will be equally good or at least good enough to keep your gearbox happy for another 100k miles? Spending around EUR2000 just for gearbox related things like clutch&DMF (which may not need any replace), seems not best spend money to me. Probably there are a few other things you could improve/add to your car today (like stereo, or maybe leather seats refurbishing etc) or in future (repairs? new tires?) for that money to keep your car in mint condition.