Well it seems that I've had a right result.
I sent the 3 year and six month old Modus (12,000 miles) to the dealer and asked them to take a look at the window mechanism and tell me what the problem and the cost would be before carrying out the work.
As suspected it was the regulator at fault and the cost would be as above, I would also require a new door membrane, oh and it was £92 to take off the door card and diagnose
The good part is that despite the car being 6 month out of warranty, it is being covered by Renault at no cost to me, including collection from my place of work
Apparently the regulators on Renaults are now covered for 4 years or 50,000 miles.