Completely, he's living on cloud cuckoo land if he thinks that's a sustainable solution to the crisis.

BBC: Nick Clegg interview

The Lib Dems have declared in recent weeks that scrapping the 50p rate is "cloud cuckoo land" (that was Chief Secretary to the Treasury Danny Alexander) and "impossible" (Vince Cable).

BBC: The UK's 50p rate: Tax or symbol?

This may sound like the stuff of cloud-cuckoo land, and none of it has been tested yet.

ECONOMIST: Aerobiology