I do think that the number of flights is the right question.
I still think that there are alot of people, not you, who not only fail to read the instructions for security but then complain when asked to comply!!! So using up more staff on enforcement rather than on the actual checks.
The M25 was a reason that the terminal couldn't go further westward, the runways limit the north and south dimensions so it can only go eastward. I understand but I am sure someone could have designed it better.
The airport is designed for the majority who do sit at the back and do want to fly cheaply. They all think they are special as well.
We can all see faults with things thats the easy part but changing things is alot harder.
Whilst not an excuse rember that T5 was designed pre 911 when security was not such a big issue.
Finally as you have all said you can all vote with your pounds, euros and dollars.I will continue to use both T5 and BA, and yes I do have a choice.