Lots of ancient Scouse ones because my fam are all from Liverpool. Invariably they refer to old radio and tv adverts from the 50s and 60s, “Gone for a Burton” for when something is lost, broken, missing. "Well i’ll go to the-foot-of our stairs for something you’re meant to find exciting but don’t. “In like Flynn” which meant Erol Flynn; old-time 40s screen heart throb, meaning someone getting a new girlfriend or expanded to mean just being lucky generally. Also something being “A pig’s foot in the morning” when you’ve bashed your head or bruised yourself or whatever.