I suspect I got lucky on this one - the name of the car suggests that it was built by 4 people with the initials T.E.S.T. Still, every point is welcome at the Pro level.
I've never seen that photo before, nor have I heard of the car. Many British enthusiasts built trials cars in the 40s and 50s of this type, usually Ford 1172 s/v powered, until Mike Cannon came along with his lightweight cars which were readily available and affordable.