The issue is the requirement for sale in the UK
The packaging MUST stste EN1078 and not the other standards.
Hence the statements such as "This helmet may pas other standards such as CPSC or Snell B90" itthen meets the requirements.
Always research helmets independently and look for the standards.
yes your right, but on a thing on the net about Snell standard it did say they don't specify snell but are tested to that standard. - all american helmets conform to snell so If you buy a helmet from the US , it should be a good un - I presume.
All helmets pass CPSC (as with the EN1078 in teh UK), but there is
no requirement for a helmet in the US to pass Snell certification. Giro for instnace have massive US sales, but do not have Snell certification.