I read this article like two days ago but have been too lazy to post it until now. It's by Matthew Parris, a regular columnist for the London Times, doing a guest spot for the L.A. Times. It's interesting from his perspective, as he was elected to the British House of Commons in 1979, the year Thatcher was elected Prime Minister. He makes some complimentary observations about how well Meryl captures the essence of Mags. Click here for the article.
post script: My double feature date with Kristan got postponed to today and we saw both The Artist and Young Adult. There was an Iron Lady preview before Young Adult, and when Meryl was shown onscreen the woman behind me said, "Hmm. She's done it again."