Welsh town built most famous spaceship in secret

The construction was done with the utmost secrecy. The ship could outrun almost any other vessel in the galaxy. From the BBC:

A relatively long time ago, in a west Wales town not too far away... arguably the most famous spaceship in the universe was created. In the winter of 1979 word started to spread in Pembroke Dock that a flying saucer was being built in an old giant aircraft hangar in the town. Those involved were sworn to secrecy. For three months they worked on the only full-scale Millennium Falcon, the spaceship from the original Star Wars trilogy, to be built for the films.