I think it was once on HIGNFY or something similar that after a bit of usual type banter somebody said, "I think they're just taking the p!ss out of London".
To which someone else replied, "I wish they would, it would save it all ending up in the Thames!"
When my sister worked for Thames Water briefly back in the 80s, she was told that 30t of London dog sh!t went in to the river daily. I suspect it’s a bit less now but one can understand the lyrics of Waterloo Sunset