We Shall Fight Them In The Streets
S1, E2: When planning for the Nazi invasion of the UK the physical defence of London was considered crucial. A ring of steel and concrete was thrown up around the capital as well as utilising natural defences.

S1, E2: When planning for the Nazi invasion of the UK the physical defence of London was considered crucial. A ring of steel and concrete was thrown up around the capital as well as utilising natural defences.