Rex Mars

Need the name of Ah-ha song?

I was watching Life on Mars and there was a song on it. I know its from the 70s because life on mars is set in 1971. I think it was sung by the band T.rex. It was also on Hot fuzz and the mars planets fruit machine advert.
The bit thats played only has the phrase AH-HA! in it
Does anyone know the name of the song?

I don’t know if you are talking about the US or UK version of Life on Mars. I haven’t seen the US version, only the UK version which is set in 1973. So not sure if they will be the same music but there is a song in the UK version called Blockbuster by a band called The Sweet which has the words “aah aah” in it: http://www.sing365.com/music/lyric.nsf/Blockbuster-lyrics-The-Sweet/D171B7507779E41A48256D750015548B

Ah! I just looked up the Mars Planets advert and it is the song Blockbuster by The Sweet.

Vintage Marx Rex Mars Planet Patrol Wind-up Toy Tank