"I'm trying to visualise an airport run as a low-cost operation. Just imagine things such as paying an extra £5 to go to the front of the security queue, £1 to have your shoes x-rayed, £2 to use the little train between terminals (seeing as those terminals would be used by the competition), £1 to have your passport checked at arrivals, £2 for a baggage trolley, 50p to stand at the best part of the baggage carousel..."
Try to understand the fact that you already pay for these things through the price of the ticket. The difference with Ryanair is you would only pay for what you use.
Yes do imagine O'Leary international where you pay £10 to go through fast track security, £5 to get a train rather then walk between terminals, £2 for a baggage trolley (largest coin), £20 for access to a premium lounge and £5 for priority boarding. This gives you most aspects of a business class product for the price of the average fuel surcharge.