Wikipedia
Gertcha
"Gertcha" is a song from Chas & Dave's 1979 album Don't Give a Monkey's, which was released as a single in May 1979 and entered the UK Singles Chart at #67. The song stayed in the charts for 8 weeks and peaked at number #20 on 30 June 1979. In addition, the song was used as the music behind a notable television commercial for Courage Bitter.