If there are no networks defined, as far as RIPE is concerned, it's un-used.
We just got audited for RIPE for exactly this reason, and they made us specify details for all of the networks we use on our allocation to be allowed to keep our address space.
Well, if they were feeling ballsy, they could just declare it unused, break it up, and start assigning it. A lot more network nerds would listen to RIPE than to some random UK pension bureaucracy.
We just got audited for RIPE for exactly this reason, and they made us specify details for all of the networks we use on our allocation to be allowed to keep our address space.