You could think it's a TR2,3 or 4, but the later 3's and 4's had a long nose starter. The earlier units had a short starter that would fit into that bulge.
However, the case has the wrong shape for a TR unit at the bottom, and those "wings" or bosses for the clutch arm doesn't match TR units. Maybe more like a small triumph, but the spitfire and GT6 had ribbed bell housing. Maybe a Herald or even a Morris Marina. (Yes they used a 1275 with a spitfire trans.)