Get the guy back, ask him to tidy up, show him a copy of the diagram I posted, suggest group factor is better and also suggest he goes and hires a wet cutter and goes in to the brick where cable bulging might interfere with the plastering line.
I'm sure Chri5 did not mean to omit that there are limits as to how far he can cut into the wall. Can't remember them off hand (it's my age, you know!), but I'm sure someone will post a link.
I couldn't remember 53 yo head
A 6th means something isn't that through the whole wall