Not if you want to make them unattractive. Maybe the subtlety was lost on you ... ?
But anyway ... playing Devil's Advocate..... if you get paid (for example) £300 salary at the bottom of the payscale for a days shift, and £600 at the top.... why should an extra days AAVA work be double time for one set of workers but not for the other .. ? Surely that is age discrimination ?
It depends on who you want to make an AAVA unattractive to. They should be unattractive to management by virtue of being more expensive to them than employing the correct number of staff (as anotherthing also said).
also playing devils advocate... is the whole spine point system not age discrimination too then?... or why should a newly valid, but at MUR, get paid less for a days overtime than someone who doesnt meet the MUR but who happens to be 3 or 4 points up the scale? They already earn almost twice as much but are less useful. I would suggest that as an AAVA you are only an extra number to get to that required on the day, therefore experience is irrelevant, and hence its a fixed rate. (plus, it would make the system for offering them much more complicated too if how much they earn comes into it!
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P.S.
' ' ' ' ' ' ' ' ' ' ' ' (please feel free to use these if i miss anymore out!)