After the misadventure at Hampton Court Palace, the London Bus tells Beatrice that he will never drive into a building ever again. When the Queen sends them both an invitation for tea at Bucky (Buckingham Palace), the London Bus changes his mind, of course. There is a problem though - the Bus is too big and needs to be resized. The help of the sloppy Magician with the 1000 Hats is needed but the royal invitation turns into a nightmare. Yet, they receive another important invitation. This time, to a royal horse racing event where the London Bus gets 'horsed' around while Beatrice becomes FAMOUS! Now the sky is the limit. Beatrice arranges a bizarre exchange programme between Westi (Westminster Palace) and London Zoo but MI6 spoils it all. There's more trouble in the city. London Eye gets super-miffed with the Mayor and goes on fun strike! Beatrice helps sort out the argument and the best cabin party in the sky awaits them all when the impossible happens ....