I've got a couple EI award flights coming up in July (booked with United miles) flying on Stobart Air metal (DUB to EDI and return). Award tickets are for economy (booked at the "Saver" level, though I doubt that's in the mix).

What rule governs baggage allowance for these award flights?

On their website, this flight clearly falls under "Flights within Europe" but they have baggage allowances labeled S, M, L and XL (nothing conveniently labeled "award flights booked with partner points"). So which of these buckets do I fall into with an award ticket?

Thanks!