Wait in lobby of building until 8am
At 8am, make mad dash to lift as all others waiting, even those who arrived after you, will be rushing ahead of you (tip: last one in, first one out!)
Get in line for security on 3rd floor (see above re: mad dashes)
Take out mobile phone and any electronic devices before putting bag through xray machine, and hand to guard to keep while you are inside.
Put bag through xray.
Walk through metal detection machine.
Go upstairs anytime (they open at 9am) and get a number.
Go back downstairs until 9am and have a coffee.
Go back upstairs, wait til you are called...and take care of yr business.