Hey your welcome, no need to thank me!
Every year, thousands of new homes are built and occupied with missing or no cavity wall or roof insulation. It is wrong and the inspection regime is flawed.
If you had complained earlier, it may (or may not) have been rectified, like this house was!
When you come to sell your EPC should reflect he missing insulation, or you could be held liable for misrepresenting the property and perhaps even having to pay for insulation to be retro fitted.