Green’s Dictionary of Slang

the anus; usu. in phr. go up the council.

1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: council gritter rhyming slang Arsehole; dirtbox, Council gritter – shitter. As in: ‘Watch that one. I hear he takes it up the council gritter’. Also Gary Glitter.
2001		H. Warner in Erotic Rev. May 25: I ask him if he wants to go up the council with me. He frowns. He isn’t really very bright. ‘You know? Council? Up my Gary? Gary Glitter?’.