It is so hit & miss, 15 mins to 3 hours for security. Day/time doesn't seem to matter- totally random. My visits through T1 & T2 over the last 4 months have been grim, particularly T1. Not just the security queues but the whole experience is depressing. I'm due to fly on a rare Cathay direct to HKG on 20th May, but now decided to swing by colleagues down south & exit the UK via LHR, I'm lucky my ticket allows that. Definitely won't be using MAN for the foreseeable. Maybe they need to employ Jeremy Spake to come & sort out their mess?