erm AOG the rule for crash helmets is
only sikhs are allowed not to wear crash helmets when they ....
OR everyone bar sikhs has to wear ....
as for knives - old legislation - those going to and from work
and also scots were allowed to wear a skean dubh ( small knife is sockies)
so yes the rules are the same ....
BUT some rules are not enforced -
isnt the SUnday observance act 1677 still in force ?
https://en.wikipedia.org/wiki/Sunday_Observance_Act_1677
but that as they say is a different subject
because there is a rule doesnt mean it has to be enforced in absolutely every case. Blackburn v MPC - 1968 case on prostitution I think
bit of technical answer I'm afraid