Won't Leuchars be able to provide a service using their Primary Radar?
Yes, but without SSR they're having to vector all the Loganair schedules at least 5nm away from all unidentified traffic, whereas with SSR they can alternatively descend the Loganairs to 3000ft above the level of unidentified transponding traffic. And with no SSR info, the Leuchars controllers have no data on who an unidentified aircraft is talking to, and therefore no basis on which to phone up another controller to ask the intentions of that traffic. Much more constraining.