I've just bought a helmet for trackdays and the Pod. It is actually a carbon fibre shelled motorcycle helmet and complies to the Euro spec ECE R 22-05. AFAIK this is good enough for use in normal trackdays and Pod RWYB days as the tests done for this spec are the same as the British Standard "A" tests for car helmets.
My questions are....
What spec helmet do you use for trackdays? Car helmet? Bike helmet?
Have you ever been refused access to a trackday for taking a bike helmet?
Do the trackday organisers even care as long as you have a helmet?
Quick pic of my new lid....