Re: TEMPEST in a teacup (with biscuits)
"even the caretaker's taste in biccies."
Of course. Because the Russians might bribe him (or her) with biscuits. You know what caretakers are like. And in any suitably stereotypical spy fiction the caretaker is the weakest link and the route into all areas.
In fact, wasn't that actually exactly how the British managed to destroy the German heavy water supply?