I think the pond is pretty much finished now. I was hoping to use clay to waterproof it, but we had to use rubber pond liner in the end as the earth seemed to be contaminated with somthing soapy below about 80cm down (there's a drive through car wash about 300 meters away, maybe it's from there?)
Anyway the rest of the materials used are hopefully amphibian friendly, there's live moss, rotting wood, large pebbles to hide between and loads of plants, both marginal and aquatic. We will add more rotting wood as and when we acquire it so this should provide the newts with woodlice and other insects to eat with a bit of luck.
At the moment I'm thinking about digging some kind of underground hibernaculum, but the logs and rocks should be almost as good if we don't get round to building it just yet.
As of now there's only the frog in residence, but it's absolutely heaving with black mosquito larvae, which is keeping the I. a apuanus larvae i'm raising well fed!
Oh and I built a Chelonia proof fence to stop the Leopard tort's from bull dosing the whole lot into a muddy elodia and moss soup!