Audax rides

The rating will be for some colours only I suspect.

I think you are right, the larger label (presumably with the conformance statement) is only present on the orange and yellow hi vis versions.

Thanks for the Decathlon suggestion, and to @frank9755 for the Raceviz options. Both look rather warm, as I was hoping for something mesh-like, as can be found for runner's vests, but that still conforms to the required standard. At £6.95 with postage included, I'll maybe give the Yoko one a try first and see how it is.

[Edit: the Yoko ones seem legitimate, I found some non-ebay working clothing suppliers of these, e.g.,
https://www.buyworkwear.co.uk/hi-vis-c188/yoko-hi-vis-open-mesh-vest-p4057
]