theme tune name

[sartut]

Brain of Britain

[kempie]

http://en.wikipedia.org/wiki/Brain_of_Britain

[reinganum]

I imagine you were referring to the current or recent series, in which case kempie's answer will give you what you need.

I used to listen to this in the 1950s and the programme opened with a couple of fanfares; the closing music was specially written. I don't know when the music changed; probably when Brain of Britain became a programme in its own right.