There is also this.
The Official Secrets Act 1911
There are numerous areas that are considered prohibited places under s3 of the Official Secrets Act where it is illegal to collect, record, publish, or communicate to any other person photographs or information which is calculated to be or might be or is intended to be directly or indirectly useful to an enemy. These include:
The Secretary of State may also declare any railway, road, waterway, power station, waterworks, nuclear power station or any other place owned or being used by the state a prohibited place although nowhere currently is.
- Military establishments, munitions stores, aircraft and ships
- Civil Aviation property and naval dockyards
- Telephone exchanges and communications centres