Legally they are obliged to have an office with a set of post holders - it’s rule 1 in the AOC rule book. It’s not uncommon to have 90% of the work outsourced or done elsewhere; lots of airlines do this.
As for easyWizz, I didn’t realise this at the time, but having put Hester as chairman, it now makes a bit more sense. It was being readied for a takeover and/or sale.