.. the sort that had a nail or screw through the strap with a slot at
one end. the other end goes round the cable, through the slot and folds
back to secure.

What are they called? Are they still legal? Can you still buy them?

ISTM that, especially the screw ones, are much more forgiving on
difficult surfaces than the plastic ones with an obo(?) nail on one side.

--
Pete
Lose (rhymes with fuse) is a verb, the opposite of find. Loose (rhymes
with juice) is an adjective, the opposite of tight.