The children enthusiastically helped Post Office engineer Tommy Flowers to build Colossus, the world’s first programmable computer. They found out how this clever technology cracked secret coded messages and learnt about codes and ciphers to understand the principles of early computing technology. During the workshop they worked as a team to reconstruct a human Colossus and reveal its vital role in the D-Day landings. The children also had a chance to ride the Mail Rail and experience a journey back in time through the original tunnels and station platforms of London’s 100-year-old postal railway.
Sworn to secrecy 
Find the combination code 
Working out Morse Code 
Travelling by postal rail 
Inside the carriage 
Dressing up to sort the mail 
Hands on games 
Old Postal Uniform