There are pluses and minuses, Bluemagnolia. Basins (as we call them here), are longer lasting than liners, and less prone to puncture, but there are only limited designs available, and they can be more difficult to install, especially the ones with shelves. A much bigger hole than the basin is needed, with sand packed around the sides, and under the shelves. On the other hand, the rigid, level shelves are a blessing when putting in tall potted bog plants, such as water Iris or Canna.

If you look (go to Google) at the millon pond website you will find all the info you need. Also the .www.wildlifetrust.org.uk has a booklet you can download. I have myself just made a pond out of an old tin bath. Good luck with yours. Welcome to GOY

Mould best, last longer. Either one you still have to dig a hole

I prefer a liner as it conforms to the shape you dig, mine was guaranteed or 20 years that was 10 years ago. I dont like the rigid edge you get with moulds but its personal preference!

Thank you all.