Thanks all for raising different things to think about!
I'll be travelling without checked luggage, and GLA says you should arrive 4hrs before for long haul flights (god knows why!), so I assume they'd let me airside too. If not, I'll then just find a corner landslide to work on some emails etc.
I usually have very few meetings, if any, on Fridays, so you shouldn't find a complaint here on the forum about a rude and loud woman shouting at her laptop, surrounded by half a dozen coffee cups