Kalimera Dimitris!
I thought you would be surprised at the 'goings on' at these U.K. rural airports. Some flights will have three or maybe more companies all selling seats on the same flight., as well as 'independent' direct bookings. I found it a lot cheaper to book with 'First Choice', as this flight was £30 cheaper than the 'Thompsonfly' booking on the same aircraft! It was also cheaper for me to book at the Thomson Travel Shop near to where I live rather than on line where they wouldn't sell me a 'single' seat! Very strange.
This is going to make your taverna booking system a bit more complicated!
Yammas,
Martin.