Historic environment records are being stored in what used to be an emergency hub in case of a nuclear bomb.
The bunker in Folkestone can only be accessed by a ladder and was built in 1971, estate agents say.
Steven Thorpe is told he has breached planning rules by installing a chunk of the wall by his house.
The Grade II listed bunker was originally built in 1941 as a World War Two radar station.
The aircraft was rescued from an abandoned New Zealand airfield and shipped home to Bristol in 2018.
Grace, 16, and her grandad are restoring Lightning XR724 at the former RAF Binbrook in Lincolnshire.
The 1960s monitoring post at Scarborough Castle would have housed volunteers in the event of war.
Radio Berkshire's Lorin Bozkurt explores the origins of a secret emergency war planning facility.
Volunteers who helped restore an Edinburgh nuclear bunker are worried someone will be hurt because of safety issues.
