In the 40's to late 60's BritishArmy, anklets are not restraining cuffs as in shackles or those deliciously exciting and turn-on gold ankle bracelets (now sadly out of fashion.........) worn by ladies but webbing supports-of-sorts worn around the ankles, over and above the boots that keep your trousers from flapping around. Done up with two leather or webbing straps that should be on the outside with the straps facing the rear.
No doubt someone will show a picture of them. But the answer to the question is NO, I don't know who GP&R are!