After finding in my cellar today a sheet of insulation it was time to get the last wall to be insulated done and finished. Just one more joint to finish on the outside and all the parts of the chimney can be jointed together.
The gap round the hole is because of the possible heat from the chimney.
The pipe as it comes through the wall will also have insulation around it.
Plasterboard up and screwed in position now i need a tub of an adhesive type material like plaster to finish the joints etc.