Again, looking for spare parts for an owner brought us to investigate this item...
Hand Brake light switch is part number 82AB15852AA which means it’s from a 1982 Escort which I suspect would be an early Mk3 Finis is 6111456.
A check on Ebay and we found one for a bargain price of £3 !
I did some more research and found it was probably used on many cars at the time...
Ford Fiesta MkI (1976-1983) D3.10 - Parking Brake 5/76 - 8/83 6111456 82AB 15852 AA
Ford Fiesta MkI (1976-1983) D3.20 - Parking Brake 8/83 - 12/88 6111456 82AB 15852 AA
Ford Sierra MkI (1982-1986) D3.10 - Parking Brake 8/82 - 12/86 6111456 82AB 15852 AA
Ford Escort MkIII/Orion MkI (1981-1986) D3.10 - Parking Brake 8/80 - 1/86 6111456 82AB 15852 AA