Is it really true that BA's ABZ lounge closes at 17:30 on Sundays? That's 2.5 hours earlier than weekdays, which means there's not much in the way of lounge provision for the penultimate flight and nothing at all for the last one at 20:20 (unless you arrive ridiculously early).

PP will at least get you into the Northern Lights lounge but that also shows as closing at 18:30 on Sundays. So you have a good hour where you'll be sat in the terminal (or realistically closer to 2 hours, knowing BA's short haul punctuality most evenings).

I realise Sunday evening may not be the busiest day for travel but it does seem a poor showing overall. First world problems and all that though ...