I was a bit troubled to find this gap in the outside wall of my house.
As I understand it, these houses built in the 1980s have walls made of concrete blocks fronted with a limestone-coloured substance (powdered reconstituted limestone).
The limestone front seems to have just crumbled away into dust, leaving the gap shown. A pipe leading into the house is now showing. Would this be gas, electrics or water? The area around the gap appears to be dry.
How can I fill the gap? Or should I let a professional undertake the task?
Thanks in advance for any advice.