I wimped out of doing mine due to the sodding wet days and not having a firm surface to work on. Got it done at a local Brittany mechanic for €216 (labour only as I supplied the parts which cost €94). They also checked the brake fluid to see if it needed to be flushed for that price.
So all up (including parts) the timing belt change cost £266.
I've spent the last 1.5 months prepping my Hymer for action - oil & filter change, air & fuel filter, Gear oil change, Coolant flush, timing belt, brake fluid check, new awning gearbox, complete spit and polish in and out, de-rusted any underneath (wire brush, anti rust, bituminous goop). Installed air assist suspension, 200 watt solar system, twin rear cameras, SOG, new velcro on curtains, Froli bed springs and I'm still going. Coming are new batteries, a 24" tv, see if I can sort out the fridge to get the gas to light better and run on EHU, install fridge fans, reseal two skylights, install LED lights and some 12 volt sockets.
Then maybe I can start my holiday