I must be the saddest git on the planet at the moment as I have stepped up my hobby about the Birmingham Superprix.
I have just contacted a safety barrier company near Birmingham and they said they got the original Armco barriers used for the Birmingham Superprix.
I went there and immediately recognised the white, red and blue stickers on different piles of Armco beams in the compound. A chap there was so helpful and provided me a lot of information about it. I took some photos:
The Armco above must be from this track section on the right of the photo there:
Seems like the Armco are still stuck in time since 1990.