Found the page now:
http://www.bikeparkwales.com/test-the-best
Yes the services aren’t the same as say Loco, TFT or Mojo would charge you £100+ for – the fork service is a oil and wiper change – I do these myself every 6 months, it does help, especially if you’ve got the era of Fox that likes to eat it’s stanchions – but it’s not a proper service.
The rear service is an air-can service and inspection.
They’re “plus parts” too, so I suspect bare minimum you’re looking at a seal kit which is about £20 for the shock and £30ish for forks.
It does sound like the perfect job if you’re enjoying a day in the park and something starts to play up a bit, seems it can be done whilst you wait – but if you’ve got a serious problem or it just needs some proper TLC you’d be better off sending it off to be done properly.