Hi, it was a Wyvern tail wheel (looks the same though).
There was one on a stall at Old Sarum yesterday! Several people were discussing it but no one appeared to recognise it. The combination of what appers to be a hinge on the edge and a hole with a clip for a fuse were distinctive features. The venor had his back to the Wasp helicoper so should be identifiable. That said it didn’t look in any better condition than yours.