I'm not sure that type of pool will be viable in the UK unless you're OK with very cold water. If you are you probably want to have a look at builds that incorporate insulation. Shallower pools are also easier to heat.
A conservation area in Exeter so I won't hold my breath! I spoke to a few manufacturers (Isotex, Thermomur, etc) about using insulated blocks for a pool and it's already a thing, but you need to use their wider products.
I plan to self-build a pool at some point after watching this video:
https://www.youtube.com/watch?v=R2MYUSAwmVo