My wife used to be a supply teacher (before getting a permanent contract and then getting ou, in that order). I always had this battle with Oxford “A” UBO as it was then as they always refused all supply teachers as being on a customary holiday. (Never had that problem with Oxford “B” UBO, Funny that!).
A supply teacher is paid for the hours they work and so during school holidays are not paid at all, unless the contract they hold is through an agency which pays something by way of a retainer. Therefore during school holidays they are genuinely unemployed and should be eligible to sign on. To my mind therefore the inclusion of a wage would be incorrect, unless of course they have earnings from another source at the time.
Lit the blue touch paper, stood back and watched and waited!!
Do I know what I'm doing? The jury's out on that........................