Shortly after I got my PPL, the company who I trained with (UK) were tasked with flying an organ to Scotland from the Midlands and took the 172 I had been flying the day before.
One of the conrods appeared through the side of the cowling on long finals and the aircraft ditched into the Firth of Forth. Both chaps on board escaped ok and Navy divers recovered the organ a couple of hours later. The operation went ahead successfully with a slight delay.
This may help to explain some reticence in the U.K. towards using singles.
On a couple of occasions since, I have carried organs on the flight deck of the big stuff.