Car still doing this so taking it somewhere next week. May take it AKS Tuning in Bedford, as I have heard loads of good things about Alex there.

This is probably a stupid question, but as they are a Revo dealer, I take it he could look at my Revo settings, even though the remap was put on at a different garage, on the off chance there is a mapping issue?
 
I'm sticking with the clutch diagnosis but I'm sure any revo dealer can take a look, obviously it may incur a charge.

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That's cool. Just trying to come up with less expensive scenarios haha
 
Quick update - car is booked in at AKS Tuning on the 20th and Alex is going to take a look at the Revo settings, fuel trimming, cam follower and also see if the clutch is slipping. Fingers crossed he finds the issue!