Green’s Dictionary of Slang
SE in slang uses
down the banks
[the steep banks found in peat bogs; those who fell off them rolled down into the deep, peaty water]
2. a reprimand; thus give it/someone down the banks v., to scold.down the chute down the gurgler (also down the gurgle-hole) [SE gurgler, echoic nickname for plughole]
[1970s+] (Aus.) used of something that has not worked out.down the pan (also down the chute, ...crapper, ...shitter, up the pan) [i.e. the lavatory pan /crapper n.1 (3)/shitter n.1 (4)]
[1930s+] wasted, lost, ruined; often as go down the pan.