Nick Holmes, of Binary Law, has a search engine called blawgle. It is built on Google and searches UK law blogs. Until I get round to putting my own concordance together, this might be useful for finding legal language. On the other hand, since the sources are blogs, it may not be.
I looked up flying carpet and got five hits, as expected, for Mr. Justice Singer being removed from a divorce case involving a sheikh in which he made Moslem jokes, and two, unexpected, for ‘Flying carpet theorist refused a patent’.