THE ULTIMATE CODEBREAKING CHALLENGE
Thank you to everyone who took on our Berlin mission this winter.
We will be back with our London mission in July, registration opens on 1st May 2026.
Please fill in your details to register your interest below and we will send you over the registration link as soon as it opens!
LONDON | 50* MILES | 10 CODES | 1 MONTH | JULY 2026
Have you got what it takes?
Make your summer count and support the Army Benevolent Fund.
Your Mission: Cover the distance, crack the codes, and deliver the final message before time runs out.
From July 1st, embark on a thrilling adventure set in 1941 securing a new line of communication from Bletchley Park to The Cabinet War Rooms in London. You must deliver an encrypted message to Sir Winston Churchill on time - have you got what it takes to go undercover and complete your mission?
Join from anywhere using your phone or fitness tracker.
Tackle codes, explore the outdoors, and discover the true stories of WWII heroes in one of the UK’s most innovative events.
Join one of the UK's most innovative events and prove your codebreaking skills!
*Option to adjust distance to suit your ability.
CODES
Choose from three code levels:
- Junior
- Codebreaker
- Cypher Expert.
Join this exciting challenge this summer and support the ABF providing a lifeline to soldiers, veterans, and their families.
You have one month to walk the miles, crack the codes, and deliver the final secret message.
Sponsor a friend
Find the fundraising page of someone already taking part in Operation Bletchley
