Caroli sent prepared messages while a British radio operator watched for any departure from the script. Initial transmission failures ended after the wireless set moved to higher ground in a police station. His explanation for the delayed contact prompted the German handler to seek help from Owens, showing that an existing British-controlled contact still had German trust. MI5 arranged a real meeting at High Wycombe railway station in case German observers were watching. Doubts about Owens meant that agent Biscuit attended instead, while British surveillance guarded against Caroli escaping. The staged contact then supported a request for Caroli to spend the winter at Biscuit's home as the prospect of invasion receded.
Notable Point · 1:39:46-1:41:50
Controlled wireless traffic and the staged Summer-Biscuit meeting
Wireless supervision and a carefully staged meeting kept Caroli's German handlers confident while MI5 controlled his movements and messages.