Just asked the man shape and it was from Brico Cash - can’t get a link as their website is absolutely terrible!
Bricomarche €19 for 100L (my bag is that too)
https://www.bricomarche.com/p/isolant-plancher-vermiculite-sac-100l/3434550266819
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Thanks for that @toryroo It would never have occurred to me to look in BricoCash but I shall next time I can go. The Bricomarche link is probably more reliable 
Our local BM and B cash don’t stock it…but lots of building stuff
Would composting grandma into a flower pot be ok…?
This would solve the problem OH thought of yesterday when I said I was happy to go on the bonfire - no bonfires between May and November!