IAG can use the returned slots as they see fit. The restrictions only applied to the new entrant, ie VS. There would be no point in forcing IAG to use the slots only on the remedy routes, which were originally selected as those routes on which IAG had a monopoly following its acquisition of BMI. And in any event such a restriction could easily by circumvented by IAG, eg by BA reallocating its own slots currently used on the remedy routes.