I am not good with estimating distance, but my guess is that the Corinthia Hotel is about 1.5 to 2 miles from Parliament.
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I don’t know so asking...
How much under ground work (tunneling, interconnecting bunkers, etc) was done during the bombing in WW2 and also during the Cold War when a return of bombing campaigns were a fear?
House of Parliament is south 1/2 mile from the hotel.
Extensive tunnels exist in London - there was actually quite a bit of anon work when the hotel came up back in early Q posts without a name but just pictures and then again when it was specifically posted by Q from post #2794-2800.
Both times there was discussion of the underground tunnels that exist between that hotel and some of the intel locations.
Whitehall is right next door. Ministry of defense police 1 1/2 blocks south. Scotland Yard just after that. So I would expect that entire area to be honeycombed to allow below ground passage and bunkering.
Good points.