Most weekends you will find a Seneca flying sightseeing pax over central London from Stapleford, I used to fly a Seneca 1 and a Cougar (neither great on one engine) over the city for traffic reports, these days, like ShyTorque I go to Battersea regularly in twin rotary, and on a beautiful day I find it difficult to believe I'm being paid, (on a grotty night its' a different matter!)
Sometimes you will hear a Rapide flying the same route as the Seneca, and they are truly poor on one!
SND