it all sounds perfectly reasonable, but to my mind its incredible red tape .At what point does it stop? I mean, will you have to carry even more spare parts ?, or a portable drugs test kit , a portable heart attack detector, or a dementia detector !
...on cars where for many models its impossible to change a bulb at the roadside...has anyone changed a bike headlamp at the roadside ? I never have.....I just wonder how many can.
TBH I have never carried spare bulbs, and in any case, how do they know they are correct for your vehicle ?
Is the high viz rule in force for bikes now ?...or do you mean carry one for passengers if you breakdown?