Check the oil level 1st to rule that out then I'd be replacing the pressure sensor on the front of the block to see if that's the fault
Try a new sensor, only £8.50 http://www.ebay.co.uk/itm/Clio-16V-W...item3f05ff3b3d
Just to the left of the oil filter as you look at it from the front
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How do I access this? From underneath? Does it require an oil change as well or can I get it out and replace in one go?
is that brake fluid light/handbrake on on too or worn pads whichever it might be