Whilst a stude at RNEFTS in 1978/9 the Firecracker was being evaluated by CFS staff at Leeming.
Recall Bob Cole pitching up in it at Topcliffe one day and organising a "draw" to select a stude to fly with him back to Leeming in it. Wasn't me.
It was a sleek looking machine - painted in camouflage - I think.