I thought this, too. This developer is a CF for not using properly illustrative photos for what is clearly a much smaller house than that shown in the photos.
Personally, I'd call them out on twitter or Facebook about it, but then I'm an irritating twat like that.
Also, they have air source heat pumps.... which can be expensive as they need to be on (using electricity) constantly to be in any way 'affordable' as turning them off and on means they'll then be trying to get up to temperature quickly, using a lot of energy to do so.
The asking price for what's on offer there is depressing.