I had a MK1 metro 1.0, it was superb!!
Still remember that good old K series whine!!
Mk1 metro's used the A series from the Mini, even the front/rear subframes
They used the A series engines but they didn't use the Mini subframes.
The Metros used Hydragas suspension that was a similar but updated version of the earlier Hydrolastic suspension that was fitted to Minis for a time having previously been used on Austin 1100/1300s. Hydragas had gas under pressure with fluid as well and also had shocks on front but not on rear.
Over the years I've had 4 Minis and 2 Metros. One of the Minis started out with Hydrolastic suspension but I converted it to the original rubber-cone suspension. The suspension arms and subframes are even different between the "dry" and "wet" suspension systems on Mini.
If my memory serves me correctly someone who raced Metros removed the rear Hydragas suspension on his Metro and fitted a Mini subframe as the Hydragas was a bit "bouncy", think he left the front Hydragas though.