No there's a drain plug on bottom of gearbox and should be a filler point somewhere. It's in garage now letting the professionals do it. He just asked me to see if I can find out how many litres before he rings Renault tomorrow
I'd be worried if I took my car into a garage and they didn't know how much oil is needed for the gear box. How do you expect them to do anything on the car? They should have autodata.