Originally Posted by
ShyTorque
The LHR CTR hasn’t been Class A airspace for quite a few years. It’s Class D.
Whether or not putting a restriction around Windsor (or anywhere else) keeps anyone safe is open to debate. Those wishing to do harm would obviously just ignore such rules.
Some, like myself might remember that Windsor did previously have a “red circle” around it quite a few years ago.
I only ever saw a 'red circle' round Windsor on military published charts where they were called 'Provost Marshall' prohibited or restricted areas ie only applicable to military aircraft.
Other places like Buck Palace, Highgrove and Sandringham had them too.