Daily wear also plays a part. Sweat, sunscreen and regular use all shorten a helmet's working life, so riders who use a helmet every day should expect to replace it sooner than someone who rides occasionally.

For replacement visors and care products, see helmet workshop London.

This kind of workshop sits closer to a design studio than a factory. Colourways, trims and finishes are developed the way a small run of any crafted object would be, with samples, adjustments and a final sign off before anything reaches a rider.

A certified helmet carries a label inside the shell showing the standard it meets, along with a homologation number that identifies the specific model tested. This label is worth checking on any helmet, since it confirms the exact helmet in your hands passed the test, not just the range it belongs to.

Anti fog inserts and coatings help in cold or wet conditions, but they are not a substitute for a visor in good condition. Once scratches build up to the point where they catch the light on every ride, it is time to replace rather than keep cleaning around the problem.

ECE 22.06 is the current European standard that motorcycle helmets are tested against, and it replaced the older ECE 22.05 standard with a wider and more demanding set of tests. Helmets are checked for impact absorption at multiple points on the shell, not just the crown, and the standard also tests rotational forces, which earlier standards largely ignored.