Your insurance policy may specify a required level of security for your doors and windows.
It might require that the final exit door be fitted with a five-lever mortice deadlock. It might specify a British Standard five-lever mortice deadlock.
It might specify mortised bolts for non-final-exit doors.
It might specify locks for windows.
Naturally we can help you assess your situation and plan any necessary upgrades. It's free within the local area: Clapham, Battersea, Balham, Stockwell, Wandsworth and East Putney.
(You will need to have your policy documents to hand though.)
Please telephone or email us for more information.