According to Metro News John Lennon Airport in Liverpool is going to start charging people £2 to be fast tracked through a special 'security' check queue. They had originally intended to charge everyone but backed down because easyJet, amongst others, complained. Now what's so bad about it being a voluntary charge? I bet businessmen will happily pay it and charge it to expenses and so will some others. It will have the effect of probably speeding up the non-paying queue as well.
The BAA say they have no intentions to start such a scheme, but there was a time they used to run a Fastrack queue that the airlines paid for. It might not be long before that one comes back again with airlines attempting to differentiate their business product.
At the end of the day it's called choice.