You will find a detailed description here LHR Terminal 5 Trials - Trip Report (by BCAL Sep 27 2007 in Trip Reports) Warning! May contain spoilers
But half the fun is not knowing what profile you will be given on the day.
As said above each trial is different. I was a guinea pig selected to go through the security checks several times, which meant taking your shoes off at least 6 times. You might be luckier and have something more exciting.
Times are a bit of a con. We were told originally it was from 09:00 to 12:00 midday, and then 09:00 until 15:00, both with registration from 08:00. We were finished by 13:00, so there was a long wait for my lift home but managed to squeeze some plane spotting and photography at Hatton Cross.
Do not try and take any photographs when inside T5
. They will ask you to leave if you break this rule.
MOL on SRB's latest attack at BA: "It's like a little Chihuahua barking at a dying Labrador. Nobody cares."