Interesting observation from Sir Michael Bishop (BMI) that there may indeed be a mathematical relationship between the number of security staff on duty at any one time, and the amount of time pax are asked to be at the airport (ie. shopping in a revenue rich environment) to clear the unacceptable security lines. Thank goodness BAA shopping and security staff rostering are completely decoupled activities.
More here;
http://business.timesonline.co.uk/to...cle1739175.ece