Well for it to be the clutch the clutch would have to slip and you would have a VERY sudden increase in revs & should be pretty easy diagnose from drivers seat . From your description doesn't sound like spark plugs either but pulling plugs and looking at the state of them be a smarter move than pulling a clutch without proving it slipping .

Thanks, it's definitely not turbo lag if that's your suggestion, previously the pull was very even through the range and this issue started suddenly. It stutters a little while it's trying to accelerate between 2000-2500, it almost feels like a blockage in the fuel filter.. and shows similar symptoms to a fault with an idling controller in a Sierra I had.. but it can't be either as it's RPM related. I've just spent £800 on exhaust, tyres and track road ends, plus I also have a bearing / diff issue, so I really want to identify the clutch/sparks issue before I spend another penny, because if it is the clutch.. it's a goner.

Well my thoughts are that is when the turbo is kicking in and if you below those revs then you are labouring the transmission which in turn can then wear the clutch. For the cost of new spark plugs I would put some in just as they haven't been changed for a while. When you take them out, check for their condition which will tell you quite a bit about what is occurring in the engine and specifically is one cylinder is different from the others (colour of plug, etc).

Welcome to the club There are a lot more chaps on here in the know that can assist you with the knowledge of the inner sanctum....or what to look out for before you jump in.

Either you have lost pressure on one or more of the tyres in which case inflating (a couple of PSI over the recommended as you can always let some pressure out) to see if that puts the light out and if any tyres are low on pressure then you have a leak. Alternatively, one of the sensors may be defective in which case I would take it back to whomever fitted it in the first place