The whole job looks good to me. Shame about the socket being so close and also about the pipes not being run behind the boiler, but had you said anything to them about not wanting the boiler sticking too far off the wall?
If so this could be why they did not use a stand off kit as this will, on average, make the boiler about 75mm deeper off the wall.
The blown bricks are no concern, they will probably cement round the pipes to finish off.
Bricks will blow what ever size drill you use, unless you are lucky enough to hit the mortar joint.
After seeing the pics I feel you were being somewhat unfair to them in your first post.
If so this could be why they did not use a stand off kit as this will, on average, make the boiler about 75mm deeper off the wall.
The blown bricks are no concern, they will probably cement round the pipes to finish off.
Bricks will blow what ever size drill you use, unless you are lucky enough to hit the mortar joint.
After seeing the pics I feel you were being somewhat unfair to them in your first post.