@Chris_Beer @imprezaworks @midge @punk_rallye @bloke
The Shaftec application for 172 Cup is R209AR/AL as I have posted previously.
Looking on eBay,these shafts also fit Renault Megane 1.8,1.9,2.0L 96-03 & Scenic 1.8,1.9,2.0L 99-03.
I also found that Shaftec supply outer CV joint CV345AN for about £30,listed as Scenic.
This will presumably also fit Megane & 172/182,so if only your outer CV joint is toast,you do not to replace the whole shaft,which is a big advance on the close to £500 a pair for Renault shafts.
I have not put this into practise,so it is a very promising possibility at this moment.
I will check if my local Andrew Page has one in stock so I can compare shortly.