Internal cracks around bay window and on chimney breast. Advice needed

I would suggest putting some crack stitching bars in.that would solve any future movement. Tom meyrick

This could where there is no room for expansion. In new build houses we build expansion joints in meaning that when your house expands it has a joint where it can move. If its just cracking through the mortar that would be my thoughts

The cracks need monitoring over the next Summer / Autumn period of 2020 to check that there is no further movement owing to possible subsidence. Glass strips and special ceramic glue can be used and fixed now, If the glass strips break then call by November 2020 then call in your insurance company to prove that it is subsidence. Tip: make sure you are insured against subsidence - you will normally pay the first £1000 towards underpinning. Hope this helps.

stitching bars could be part of the answer, however depending on what has caused the cracks, stitching bars won't necessarily solve there problem on their own. If the movement is not major, stitching bars may help, but they can just move the area prone to cracking further along the wall (dependant on cause). Some cracks will open and close due to weather on clay subsoil. If you have a plaster finish on the wall in that situation a slip membrane with mesh over the crack may help....that spreads the area over which the tension in the plaster is subjected to. Your structural engineer must have come up with his set of thoughts as to what is causing the problem. If he gave you an answer of the cause and hasn't given an answer of remedy, perhaps you could let us know along with photos so that further suggestions could be made