This was a lockdown project: we had the Potting Shed garden – see elsewhere – and the client (who is very good at coming up with slightly crazy suggestions) wondered if there was a place for a swimming pond.
There most certainly was so holes were dug, rocks imported (these ones salvaged from Sarah Eberleās 2019 Chelsea Flower Show garden), liners laid out and much fun was had by all. The idea is that plants set in a gravel margin will keep the water clean.
We surrounded the whole area with wildflower turf and some excellent trees.
The only drawback is that the water is bloody cold most of the time!