He could fall asleep on a washing linethis was referring to the cheapest men's doss houses where you could pay a small amount to sit on a bench with other men and lean against a rope stretched across.
In Derbyshire such people are ‘ten bob millionaires’. I heard this was said by Sheffield people of those who moved to Dronfield (in Derbyshire but close to Sheffield) and paid 10 Bob (10 shillings = 50p) less in their rates and thought they were quids in.
I once heard a supply teacher describe a child in my class as being 'like a box of frogs' - a brilliant description.