In Yorkshire hollow square pillars, formed by piling up short blocks of wood or chocks, are often used instead of props formed of a single stem.
The assembled onlookers watched as the ground crew removed the chocks and then marshaled the aircraft onto the taxiway and toward runway 08.
Aircraft that require hand starting by prop swinging must have chocks placed in front of the wheels.
A running belay using chocks, nuts or similar devices.
And a warning to myself to carry chocks and to use them if I'm in any doubt.