Any new tools you acquire through the insurance, make sure you register them with the manufacturer if extra warranty applies ( I just got a new Makita SDS mains powered and got 3 year warranty),
but also keep receipts and note down serial numbers.
The police can advise on extra security measures too. I think there is a special marker you can get. Ensure you put signs up in the van stating that tools are security marked.
It totally sucks that you got worked over, but you have to take precautions now as they will know that you will get lovely new replacement tools soon, so you may be a special target.
CCTV overlooking the van? I just put a maplins 4 camera system over my whole house and garage, plug and play for sub ÂŁ500 and that will email and text me if it goes off. Worth thinking about.