Here's a list of some science and technology based museums that are well worth visiting.
Jodrell Bank Observatory near Macclesfield in Cheshire. Radioastronomy and space science. Also contains an arboretum.
National Space Centre in Leicester. Appeared to be aimed more at the primary school level audience when we last visited.
Catalyst in Widnes in Cheshire. Britain's only chemistry museum.
Amberley Museum in Amberley in Sussex. A museum of industrial and craft exhibits. Also contains the BT Connected Earth telecommunications exhibition.
The Museum of Science and Industry in Manchester. A wide variety of science and industrial exhibits.
Bletchley Park in Milton Keynes. A computer museum located in the same place where the Enigma code was cracked during WWII.
Science Museum in London. Britain's largest science museum.