The National Museum of Computing

Rebuild of Colossus, world's first electronic computer
baby changing facilities icon Food icon Guided tours icon Shop icon Study area icon Visual disability facilities icon Wheelchair access icon

The National Museum of Computing, located at Bletchley Park, is an independent charity housing the largest collection of functional historic computers in Europe, including a rebuilt Colossus, the world’s first electronic computer and the WITCH, the world's oldest working digital computer. The Museum enables visitors to follow the development of computing from the ultra-secret pioneering efforts of the 1940s through the large systems and mainframes of the 1950s, 60s and 70s, and the rise of personal computing in the 1980s and beyond.

Venue Type:


Opening hours

TNMOC All Galleries: open Thursday, Saturday and Sunday afternoons (12 noon to 5pm in summer) plus bank holidays and special public opening during major school holidays.

TNMOC Guided Tours: Many days Book online at:

The Colossus and the Tunny Galleries are open daily 13.00am-5pm.

Organisations can arrange special visits and tours and use TNMOC's seminar room facilities.

Admission charges

Entrance to the whole of TNMOC is £7.50 per person (£5 concessions). Family tickets £20.
Entry is free to TNMOC members.

The Colossus and the Tunny Galleries are open daily. A £3 fee (£2 for concessions, free for children 12 and under) is charged.

Getting there

Full directions here:


Additional info

We are able to offer tailored programmes for educational, corporate or special interest groups upon request.

The collection is 90% hands on. We have examples of most of the popular home computers such as the Sinclair Spectrum, Commodore and BBC Micro. We also have a large selection of business machines, a couple of working DEC minicomputers (one from Blacknest, the Goverment seismic activity monitoring station) and a 1960's Elliott 803 mainframe also working (sometimes!!).

The machines are loaded with a variety of business software, games and programming languages, most of which are ready for you to have a go.

Collection details

Industry, Science and Technology, Social History, Weapons and War

Key artists and exhibits

  • One of the most important items in the collection is an Apple Lisa. This was the first commercial machine to use a graphical interface, it was released in 1984 and pre-dates Windows.
Events details are listed below. You may need to scroll down or click on headers to see them all. For events that don't have a specific date see the 'Resources' tab above.
Valve Workshop Poster

Valve Workshop

  • 14 October 2017 11am-5pm

If you have a basic knowledge of electronics and can read an electronic circuit diagram then we will show you how electronics started for its first 50 years. Find out about valve history, how to handle and test valves and how valves are used in Amplifiers, Radios and Computers.

You will also be given a guided tour of TNMoC's historic working valve computers Colossus and WITCH. A choice of four different valve project kits will be available for purchase, additionally a small group of 5 guests will be able to stay for a second day and build one of these kits themselves under expert supervision - but this is strictly on a first come first served basis!

Book now for a chance to be part of this fantastic and exclusive event.

Suitable for

  • 18+




Getting there

Full directions here:

The National Museum of Computing
Block H,
Bletchley Park




01908 374708

All information is drawn from or provided by the venues themselves and every effort is made to ensure it is correct. Please remember to double check opening hours with the venue concerned before making a special visit.