Citizens of London shelter from bombing raid in a London Underground railway station, ?1940-'41.  This is a typical photo of Londoners sheltering from the Blitz in a Tube station.  Not comfortable - but perhaps better, generally, than using an Anderson shelter in the back garden.  Best regards, JR.

Down the Tube ...

Yeoman Warden (Beefeater), Royal Fortress, Tower of London

 The Royal Fortress, Tower of London was used in WW1 and WW2 to hold high value PoW's and enemy spies and saboteurs. Several German spies were executed within its walls. 

 The last person to be executed at the Tower was German spy Josef Jakobs who was shot on 15 August 1941. The executions for espionage during the wars took place in a prefabricated miniature rifle range which stood in the outer ward and was demolished in 1969.
The Second World War also saw the last use of the Tower as a military fortification. In the event of a German invasion, the Tower, together with the Royal Mint and nearby reinforced warehouses, was to have formed one of three "keeps" or complexes of defended buildings which formed the last-ditch defences of the capital.

 The Tower of London retains its military links serving as the HQ's for the Royal Regiment of Fusiliers and the location of their Regimental Museum (open daily). It also remains to this day a Royal Palace and Fortress, with the daily changes of the Queen's Guard and nightly Ceremony of the Keys.
FB/British and Commonwealth forces

Yeoman Warden (Beefeater)

German civil defense members attempt to deal with the effect of Allied night bombing, February 1943.  Much worse was to come ... JR.