Picked up a flyer about this airline today and, after checking out their website (flywho.com), the features looks okay.
They will be flying out of Birmingham starting early in July to Sandford twice a week and to (get this!) Clearwater/St Petes Airport once per week. The leg room in cattle class (Silver Class )is an amazing 38" and in Gold Class 45". All seats have individual entertainment systems, good menus (probably a better class of cardboard), special kids menus (smaller chunks of good quality cardboard), kids packs, amenity kits, and in Gold class 2x40kg baggage allowance. You can also mix and match the classes (ie Siver outbound and Gold inbound), and fly into St Pete's and out of Sandford. The aircraft looks like an Airbus A320.
The costs for two adults and 2 kids for 3 weeks in August - just over £2,400 (flights only) so cheap it ain't, but it does offer us Brits another option to get to the Sunshine State and in reasonable comfort to boot.