I was wondering about...

[col craddock]

Hoi Poloi so thanks for that Heathfield
How about
Ticketty boo
Flibberty gibbet
The bees knees

[jno]

http://www.worldwidewords.org/qa/qa-bee1.htm

http://www.ticketyboo.co.uk/

http://www.wordspy.com/diversions/fave-words.a sp#flibbertigibbet

[heathfield]

In relation to Jno's 'Bees Knees' link, there's also the expression, 'It's the business', meaning the same thing.

I've often wondered whether, with 'business' and 'bees knees', one is derived from the other.