Are the wheel nuts M12 x 1.25 or M12 x 1.5?
Mine are M12 x 1.5 - it says so on the nuts!!
Early Fords inc mk1 escort were 7/16 UNF
IIRC Cortina mk 3, 4 and 5 and Sierra are 12mm x1.5. I think Grannies are the same