Door Security
Home insurance companies and the police recommend that exterior doors are fitted with a http://www.simplifydiy.com/windows-and-doors/doors/door-security
Ventilation Of The Sub Floor Layer
In a cavity wall the airbrick should be inserted into the exterior leaf of the wall as for a solid wall but you will need extra long drill bits http://www.simplifydiy.com/walls-and-ceilings/sub-floor-ventilation
Successfully Damp Proofing Your Home
... mortar course that sits at least 150mm 6in above the exterior ground level drill horizontally into the mortar course making 12mm ... http://www.simplifydiy.com/walls-and-ceilings/damp-proofing