Explain how and which wall was cut in conservatory?

Best way to get the location is going on the tour, like I have done a few times.

The North wall of the conservatory was moved 9 feet and 4 inches in 1919. It was cut then rolled on logs, and the gap was filled in to match.

It's hard to see from inside the conservatory, but it's very easy to see from outside. If you stand in the west garden and look at the facade, there is a strip of brick that doesn't match the rest of the building just to the left of the port cochere.