I usually discuss with the customers about making good in my quotes. I personally wouldnt want to put my name to that, It looks a bit slap dash but I suppose theres nothing technically wrong with whats shown.
If you were keeping the wallpaper above the fuseboard I would have probably tried to cut the wallpaper and flap it back on itself, I would have also popped a bit of capping in the wall or at least pulled the twists out of the cable before its buried. I also use a 16mm/20mm masonary drill bit to drill behind skirting boards but then again I think I would have charged a bit more.
Looks more like a domestic installer has carried out the work rather than electrician, but thats me being judgemental and miserable because I have man flu.