1996-97 Robin Hood Go prototype (Metro-based, one of two built)
It is the Robin Hood Go (a.k.a. The Go), so you get the point.
I didn't ask what its mechanical base was, but I can reassure you 101% that it is
NOT based on a Metro, as it used Ford Sierra running gear (as can be seen by the wheels). I can imagine why you referenced the Metro as Robin Hood also launched another model at the 1996 Donington Kit Car Show (where the Go debuted, and where I took this photo), based on the Austin, but it is not this machine.