Your basic safety check (CP12) which should be done every year to confirm with not only gas safety regulations but also to keep you and your family safe
The boiler will be inspected the case will be removed all flue gas readings will be taken I will also check any gaskets and rubber seals that can perish. Finally a Gas tightness test ( leak detection test ) will be carried out and all paper work provided to yourself before I leave the property
This on average will take 45 minutes