Hello all, thanks for the kind comments. believe it or not it took me and my usual mate I rope in for any DIY five hours to build on a saturday.
Dead simple build, we built a frame using treated 2x3 and simply clad the outside with decking from Wicks (usually on offer for multiple purchase) And matches the decking out the back of the house. Once built I used allpondsoloutions underlay and liner ( bargins from ebay) then used the same decking on top to trap and cap the Liner.
The koi are all happy and the water stays absolutely crystal, which is a first for any pond ive had. Just glad I gave Israeli koi another chance as the colours, body shape and patterns have improved massively over the years and to be honest I would challenge anybody to tell the difference between these and Japanese.
I would say all in including fish and all equipment it cost no more than £200. Just worth mentioning is that I had to choose a raised pond as I have a 4 year old who no doubt would have been swimming in it if it was a sunken pond.
Cheers Chris