Front garden.
60 flagstones all 300 x 300 x 40 in Grey
Edging of either bull nosed edging stones at 600mm long OR black/red/yellow
(Whatever I can get hold of) block paving bricks

Might possibly be used as a temporary car standing occasionally but more
likely in the long term to be ornamental with a hole in the middle for a pot
plant to sit in (Drainage etc etc)

What would the group suggest as the best way of making them solid enough to
withstand such use?