Danny42C and all ATCOs and Hunter Drivers here present ... my apologies for getting the 1:1 wrong.
Indeed it was the mental arithmetic of working out the track miles/height before reaching the magical spot where the Hunter would drop the gear [and flaps?] and descend at 1:1
Did we [the ATCOs] then say "10 miles, ten thousand, wheels wheels go"? It's a faint memory, but rather unusual for ATC to tell the pilot what to do with his aircraft in such specific terms.