MM wrote
BartC wrote

(BTW the paving bricks on my drive seem
to be bedded in sand. The sand is still there.)

That's because the paving is *interlocking* !

Nope, mine arent.

Try putting just one paving brick on a bed of sand and see how long it lasts.

Mine have lasted fine for 40 years and I didnt even bother with sand, just used dirt.

And I walk across it at least once every day too.