Think I read recently that Warsaw viewing balcony was closed.
I think you could be right on that one
Sad thing is that the UK mantra of "security is paramount" combined with rampant commercialism has lead to their almost total demise.
I think the UK authorities have the misguided belief that if you keep the viewers away from the airport you ease the pressure on security. I would think the reverse is true - all it means is that everyone parks around the perimeter (including places that they shouldn't) as opposed to having everyone contained in one place. At least Heathrow has a mini viewing deck now (north of the airport). Gatwick, which was my "home" airport for many years has nothing at all.