Hi. Recently my car is over revving when depressing the clutch.

 

if I am driving in any gear when I release the accelerator and press the clutch my revs Jump up by a couple of hundred to a couple of thousands revs.  The quick I am going and press the clutch the higher the revs jump. 
 

if I realease the accelerator and wait a second before I press the clutch it doesn’t happen. If I press the clutch very quickly it shoots up by thousands of revs. 
 

I think it may be the accelerator which is the issue as there is no signs that the clutch is slipping. And the revs shouldn’t jump when my foot is release  off the accelerator unless something is holding it on?

Check for smooth/free travel of the accelerator pedal from stop to stop, it could be something as simple as mud/dirt/soft drink/chewing gum etc.

 

I was going to suggest checking for foot mat fit as I've seen some folks with mats that catch and hold the pedal on full depression but seeing as the octy has a floor mounted pedal this shouldn't be an issue.

6 hours ago, PughHC said:

And the revs shouldn’t jump when my foot is release  off the accelerator unless something is holding it on?

Agreed. I had this issue with a Citroen Xantia, caused by a throttle damper. The solution was to remove said damper.