Found the new property from today's release: https://maps.app.goo.gl/LtpiZBwSdKmgxNgy9
The house appeared in an article called "Something out of nothing" in The English Garden.
"The eight-acre plot surrounding Tunstall Grange, on the outskirts of Catterick in North Yorkshire, consisted of a collection of old farm buildings that were being incorporated into the new house design, a field grazed by sheep, a lake that James had dug and some shrubs that had been planted by James a few years before. “Our brief to Alistair was to join the field, the lake and the new house together so it felt like a coherent space,” says James. “Our architect, who loves caves and grottoes, also sowed the seed of an idea for a water feature, and Jo and I both thought it would be lovely to be able to hear the sound of water from the terrace and the house.” "
Can't find any previous listings on Zoopla or Rightmove. Nice to see something other than a white box for a change.