@solair
UK sockets would, from memory , meet French specs. The requirements are earthing-arrangement and shields over the other two pins : nothing about pin shapes.
A friend of mine had his house approved by the Consuel ( quango responsible for issuing certificate before EDF connect supply) and they had no objection that he had mixed French/Uk sockets.
Since I live in the Alps, I generally only visit two medium-sized sheds and occasionally one big one, because of large distances. It is possible that the Legrand rep for Rhone Alpes is very good at his job and that skews my view of availability.
Builders merchants pretty much 100% Legrand, but this also fits in with what I think is their general trading principle that they are offering best professional quality.
Medium DIY sheds: Top range of Legrand covering all items. Lower price with some Arnoux items and budget range of sockets and switches from Debflex = few items.
@IJWS
I don't know if you know the purchasing and stocking policies for retail chains, but they have a given space for any range of products and bringing something in involves throwing something out.
It would be hugely unusual for a shed to kick out the no 1 national manufacturer , and anyone replacing them would have to offer the complete range of all products. Legrand will hold their shelf-space because of reputation. advertising, ability to sell at high prices and probably relationships.
I do recognise that my personal feelings about this brand are not shared by everyone, especially the retailers who benefit from their large add-on.
This thing started for me when I wanted to buy double-sockets. If you want this from Legrand you have to buy:
1) 1 double front-plate
2) 2 single-socket surrounds
3) 2 single sockets
There may be other bits, but it's modular, so then you have to inter-connect the two sockets internally !! Who wants to do that at a cost of E 15-25 depending on range ?
After that I looked around for a long time and found a single-piece double-socket in a distant large store but when i got them (bought 10 osr so ) home, discovered I had to inter-connect them too