Goto Renault.co.uk > then on the left hand side click "dealer" > Or Full postcode or outer put in SW19 3BL> then look at bottom of page and what do you see
Very interesting considering someone on this forum is getting warrenty work done there AND Renault customer care told him the ECU wont effect the warrenty! I have written to R SPort asking for written confirmation the ECU does not null the engine warrenty....
I will post up when I get a response.