Hi all
I, too, have had the pleasure of flying a single-engined aircraft over O'Connell Street.I was in a Cessna 172, holding at the "Pigeon House", east-west laps. A 1-minute leg at 90 kts will easily bring you over O'Connell Bridge, under strict ATC instructions not to go above 1000'. I had about six laps before squeezing in after a Ryan -200. Very entertaining, I must say, especially the thoughts of where to put it down if the Lycoming gave up.
regards
GttC