http://www.dailymail.co.uk/news/article-2162754/Griffon-Chance-rare-successor-Rolls-Royce-Merlin-engine-auctioned.html

Where did these end up?

This taken from the comments at the foot of the article:

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Ron, Oz, 1 year ago

There’s at least one New Merlin buried under the Hanger Apron at Yeovilton. These are still wrapped and crated, buried when extensions done. I believe it’s under the Concord apron. Worth a few quid now, they’ll need running in perhaps.