“Originally John Morris [Wings tour manager] had asked me to talk Paul out of his idea to have a double-decker bus,” said Salter. “But instead of me convincing him it was a bad idea, he convinced me what a great idea it would be.”
[…]
“I sent Tom off with them to get a bus, I was hoping for a Mercedes with a bathroom in it—a tour bus. He and Paul came back grinning like crazy with this open top London transport bus with a top speed of 38 miles an hour.”
— The McCartney Legacy, Volume 1: 1969 – 1973 by Allan Kozinn and Adrian Sinclair (2022)
He’ll never beat the bus obsession allegations.