I think that is the Metro-based Midget concept of the mid-80s? I can't remember the codename of the project though, was it part of AR6?
EDIT: Yes, I just cheated it was part of AR6, so not strictly-speaking Metro based, but pretty close.
96 MGF 1.8i: Project Rally Car
98 MGF Abingdon" 285H cams, modded head etc
87 MG Metro: 1440cc fast road car
88 MG Metro Turbo
70 MG Midget: 1.9L VVC + supercharger + RWD = YEEHAA!
72 MGBGT: Project Speed 6 MGB
05 MG ZT-T 260: wife's sensible car
01 MG ZS 180: LHD, for driving around Germany in