[Otis Crump]

The window looks pretty fake and counter looks different, but a fairly decent replica if that's the case.  A clip from a few months earlier for comparison.

youtu.be 

From what I remember the impending revamp was announced very late (a couple of weeks before perhaps) although rumours about Zoe's future on the show pretty much started the day she started.  The Eggs on Legs tour took place over the last 4 weeks of the summer, with the show fully on the road alongside them the week before and in the garden the week before that.

It's the real kitchen. The window was covered up to conceal the renovation work. The views outside of the patio doors in the kitchen and the living room French windows were also obscured for the same reason. (EDIT: Actually, that window would have been filled in by this point - the new kitchen didn't have one there. It was reinstated for Johnny and Denise. From looking at the first hour video, the scaffolding on the right hand side of the house creeps into shot and you can see the newly added render.)

This is probably Keith's final week on the show before he was "off on holiday for a couple of weeks". He presented the "How's the House?" feature at this time, showing some of the work going on.