As far as I am aware, it is not the Landlords responsibility to insure your personal property, only the buildings.
I suppose you could ask for compensation, as you did not have use of the alarm fitted or keys for the mortice lock. Your Estate agency should have guidelines for compensation if you have been unable to use something, not sure if it would cover locks or alarms.
Have a look at the following link, you may find some information there.
http://www.arla.co.uk/infosheets/list.aspx?id= 1#
If you are unsure, then you should contact your local CAB office.