Tell your insurer if they are in shared accommodation and warn them not to leave items in communal areas in full view of their room mates.
Staying in halls — They should always lock their door even if they are just popping out for a moment.
Make sure they are not under insured — Student possessions often exceed £3,000 as text books can be expensive plus that expensive jewellery you got them, for there 18th/21st birthday, plus their laptop, tablet etc.
Ask your insurer are there any other options that could be added to your insurance. as the parent.
Bicycles are often excluded and you will need to ask your home insurer specifically about covering them or you can insure them under a separate specialist bicycle insurance policy.
Possession are often excluded if stolen from an unattended vehicle so unload the car as soon as they arrive at University.
Compare the cost with a specialist student insurer such as Cover4students. The specialist insurer often offers covers that your household cover can’t such as no lock requirements on your individual doors, cover in shared accommodation, excess can be lower, plus offer cover for the landlord's property.