Easy 226 - Coventry is owned by the Air Atlantic Transport group (or whatever they are calling themselves this week). Their website is
www.coventry-airport.co.uk If there is no info on the site which helps, write to Mr Peter Jackson, Airport Manager, West Midlands International Airport, Baginton, Warks, CV8 3AZ.
They used to readily accept work experience peeps for a week at a time, but outside school/college terms, they may accept you for longer.
Good luck !