Wanted to follow up on this; its taken me a year to get round to sending off the suspension! ... but
Sent my Fox 36 and X2 to TFTuned a couple of weeks ago. Top notch service.
Not only did they service the fork, they also tuned it to my riding style, changed out the seals for SKF seals which seem to be better and now the Fork performs way better than before. Way more responsive, better tracking as well. Just got back from Morzine and had no issues at all and no needing to change the settings that they set up for me.
They also phoned me to say my 2022 X2, which had developed the typical squelch, could be sent to Fox to sort out as Fox are recalling several of these. So I got a brand new 2024 X2 Factory as well to replace my 2022!
So all in all, fantastic service from TFTuned. Thanks again all for recommending and I'd also highly recommend them.