Gearbox fluid change

[Glync]

Afternoon All
Appologies for resurecting an old thread but I thought I would counsel some opinions
My old girl (2007 3 litre d Sport) is in for a service today with a local independant in Tamworth Staffs. I have been un decided should I keep hold of her or look for a new 8 as the mileage is building quickly and I know people have this thing about the "magic" 100K on a car in this country which appears to affect values when trading in etc.

In case I do hold on to her I mentioned to them when dropping her off this morning about the gearbox fluid change requirements and he suggested they should be done at regular intervals and he quoted me around £200-250 for the job of new filter and fluid. Also mentioned he would need to get the right equipment in for the job as they share the gear with their other location. I believe this is a machine to suck/pump in the fluid for the change ?
Is this a fair price for the work and materials involved? Whilst I will have a goo at most things I am not keen to do this job tbh and it seems to be something best performed on a lift which I don't have access too.

I have noticed the down changes are occassionally more "noticeable" now as I pull up. Not jerky but certainly not as smooth as they should be. The car has done 92K now and as far as I know never had the gearbox serviced.

I haven't booked her in for this yet but is there anything I should be asking or watch out for.
Thanks in advance for any suggestions/help
Cheers Glyn