I used this off of ebay earlier this year when I changed all the fluid in my auto box in the Tourer. Used about 8 litres. Drained,filled and flushed through disconnected trans oil cooler pipe a few times until oil came out same colour as new oil (original oil in box was very dark !)
Made a difference,changes bit smoother after fluid change.
Oil has Jatco and MG/Rover part number on label
https://www.ebay.co.uk/itm/ATF-N402-...52~O:rk:1:pf:0
Paul