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On an open forum like this, you have to be careful when you give advice, particularly with all the new current regulations we have to adhere to these days.
Basically, the manufacturers state that a new nut is required (as they do with most critical fastenings) to cover themselves, and their dealer network, should there be a safety related issue after the work has been done.
In practice, however, it's probably a different story. I am not going to comment on what Renault mechanics do, or other garages either, but if I was doing the job on a DIY basis, I would use the old nut, providing it is in first class condition. Remember, this is just my opinion, not a general rule. It's up to you what you do.