When you consider that is was the TRAVEL AGENTS who voted, it can be understandable.
1. Large UK airports (LPL,BRS,NCL etc.) offer alot of LCC flights which don't offer any commission.
2. Small airports don't offer enough destinations and are often only served by 1 based carrier + FR so not much money making out of there!
3. STN also offers very little money making power for the agencies.
4. The other three biggest (MAN,LHR,LGW) offer connections to destinations across the globe with the world's major legacy carrier and most importantly - make the travel agencies alot of money!
They should rename the awards: 'Best money making airport.'
Little to do with how good the airport ACTUALLY IS.