Shops that sell car helmets

[GrumpyTwig]

Anyone know of any shop(s) within the vicinity of the county that sells helmets for motor racing? Specifically those aimed at use in cars rather than on bikes.

Basically I have a motorcycle helmet (now way beyond the age that you're supposed to replace them) from when I rode bikes that I use for track days, it's a bit knackered now but from finding a motorcycle helmet that fit I remember it being important to be able to try them on first.

Just need something cheapish (not feeling the need to spend the £400+ on an Arai again), I'm not in an open top car anyway.

[GrumpyTwig]

I feared this was the answer, thanks anyway chaps.