I did this while they were on holiday a couple of years ago, they had bought the circle off e-bay and I had removed the gravel from my own garden.
I didn't bother with hardcore, just scraped back a couple of inches or soil then bedded them on a wet mix of grit and cement.
Decided on the centre and moved the soil
Used some cheap child labour to mix the cement
Used a good quality barrow
Then worked from the middle out
Our youngest did the last piece
Then missus H pointed the edge
And that was that
Next day we fitted a small fence and poured the gravel onto some membrane
Still looks exactly the same now, my Mum and Dad were pleased with it and said it was lovely to come home to a new garden.
I didn't bother with hardcore, just scraped back a couple of inches or soil then bedded them on a wet mix of grit and cement.
Decided on the centre and moved the soil
Used some cheap child labour to mix the cement
Used a good quality barrow
Then worked from the middle out
Our youngest did the last piece
Then missus H pointed the edge
And that was that
Next day we fitted a small fence and poured the gravel onto some membrane
Still looks exactly the same now, my Mum and Dad were pleased with it and said it was lovely to come home to a new garden.