I started out as a bricklayer back around 12 years ago since then I have taken some lads on my books to cover more trades to allow for more extensive of work to be taken on..
Yes the beading should have gone on when the front of the chimney was skimmed. so beading on and skim the full breast
No need for planning for a garage as long as you are not crossing any boundaries or over 4m in height.
garages are permitted development
Wait for the plaster to dry.. light salmon colour then good to go.. your hanging units to the masonry not the plaster itself..
If there was a manhole then it’s common sense there is pipe work below, it is there responsibility for any damage to be rectified at the cost of the company.. i have gone through many of waste pipes and corrected them with a rubber coupling costing around £13 i’m not sure why it has cost thousands