These are The Blades - all ex Red Arrow pilots flying Extra 300s. They say they are "the world’s only globally accredited aerobatic airline" (http://www.2excelaviation.com/). What a good idea for a firm's outing - that is if you haven't seen their aerobatics - seriously scary!! Now sponsored by Barclays so are now blue - careful, that's my money up there!! Watch them on http://uk.youtube.com.