Bad Robot, that's one of the (many) flaws in the ID plan. Non UK citizens cannot be required to carry a UK ID, so a large minority of UK airline workers will never have one anyway. Dual passport holders will (and should) easily avoid the requirement.
My airline has a large proportion of Dutch and Belgians, none of whom will be required to have Gordon's ID. So why bother at all ?
Now, if that LTN baggage handler can just get his Afghan passport issued he'll never need a UK ID, and can carry on loading things onto UK aircraft ...