I had a look at PBP night photos and there's all manner of shit so I guess they aren't that strict on the compliance. If I get something in horrible yellow with some reflective shite on it (ie. the dhb gilet thing) I reckon should be ok. Especially since my French is so awesome - angry arm waving.
yacf discussion on en471 compliant wear > https://yacf.co.uk/forum/index.php?topic=29069.0
the proviz one > http://www.provizsports.com/en_gb/proviz-multipurpose-en471-high-visibility-vest < meets en471 for width and positioning of vertical and horizontal bands