Car went into Solihull on Wednesday and was ready on Thursday morning. Alpine France are aware of this issue and the job sheet reads:
"As per Alpine technical: stripped o/s/f seat & lubricated. Refitted all. Road tested vehicle. No squeak evident"
It seems to have done the trick
Was given a brand new Megane RS Trophy (DCT) as a courtesy car, decent enough hot hatch but not in the same league as the Alpine!