Best Euphemism for death and dying....

That's more of a rhyming slang threat than a euphemism.

I'll never understand Cockney rhyming slang.

The rhyme isn't usually so obvious as bread/dead. Usually the rhyming part of the phrase is hidden. So much so that people use it without even knowing it's (rhyming) slang.

Butchers is a case in question, 'Let's have a butchers,' means 'Let me look at that.' The rhyming phrase is Butcher's hook - look, but the hook is dropped. It's meant to confuse, like a thief's cant.

As I like classical literature, It seems to me ''Hamlet sleep" is one of the best.

Nature's way of telling you to slow down.

Learned a new one (or a very old one to others). Dance the Paddington frisk.
Being hung at the gallows in Paddington, England.

That is very old Paddington isn't really known as a place of execution, not like Tyburn or Newgate.

It's not in the Telegraph's top eleven London execution sites which is what popped up when I googled it.

It's new to me, it must be really obscure.

Ian Banks wrote a book called The Crow Road.

Going down the crow road is dying.

Spandau ballet refers to hangings of Nazi prisoners at Spandau. Your imagination can fill in the rest, I'm sure.