Unto the Breach (audio story)

Sir Toby remarks “We can’t expect alien incursions to take place exclusively in the Home Counties, now can we?” — a joke about the Jon Pertwee era of Doctor Who.
Allison is very fond of tea. Rachel jokes that she drinks so much that she "practically keeps the East India Company in business."
Rachel claims that lying comes as naturally as breathing to Sir Toby.
Neither Gilmore nor Rachel has been to Berlin since World War II.
Gilmore and Rachel pose as a married pair of textile manufacturers named Robert and Suzanne Cornwell.
Gilmore has what he describes as a "smattering" of German. However, Rachel has no knowledge of the language other than a few select words.
Werner says he's part of an "organisation" with technology "from a far greater power than Germany", which may mean the Soviet Union or an alien force.
The enemy agents have gained control of both Rachel and Allison's minds by placing electronic devices in their brains. Allison is manipulated into thinking that Templeton is Sir Toby.

Notes

Allison has lost her memory following her exposure to the Soviet satellite Maurania 7 in Lower Burford, Herefordshire the previous month. (AUDIO: The Forgotten Village)
The Ministry of Defence were reporting on potentially suspect alien sightings over East Germany in The Forgotten Village.
Rachel reminds Gilmore that not every alien that they have met was a little green man. (TV: Remembrance of the Daleks; AUDIO: 1963: The Assassination Games)
When Allison starts regaining memories, she instinctively distrusts Templeton. (AUDIO: Sins of the Fathers, Changing of the Guard)
Allison tells her nurse that one of her best friends is a monkey. (AUDIO: The Forgotten Village)