Captain Ridley's Shooting Party was the codename members of the Government Cypher School used to disguise their true identity, when moving into Bletchley just prior to WW2. These were the guys who broke the enigma code, amongst others, and were instrumental in winning the war, as the allies were able to pinpoint exact locations of axis ships and armour through decrypted messages (a member of the team, Alan Turing, is my "academic great-great-grandfather", which is quite rare, as he only had one PhD student).
The members of the shooting party were all middle aged mathematicians, chess masters, linguists, crossword experts, logicians, philosophers, authors etc. It wasn't a very effective ruse, given that hundreds of people, not at all looking like a shooting party, suddenly descended upon a small town, but there you go.