Noor Inayat Khan's house

Noor Inayat Khan resided in a house in Paris in 1943. There was a space under floarboards in her flat, where she kept the radio transmitter.

When Noor Inayat Khan encountered the Thirteenth Doctor and Ada Lovelace, she allowed them to hide from the Nazi forces led by  under the floorboards inside her house. (TV: Spyfall)