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Hi Mathew, a bunch of UK SEOs are keeping an eye out on the UK Roll out of the Panda update - however there isnt any hard evidence to prove that it has been rolled out. Infact, since Mahalo still ranks in the UK, I would say that itdef hasnt been rolled out. I would look beyond the algo change to investigate your traffic loss, UNLESS your traffic loss was from outside the UK? Have you run an analytics segment analysis where your traffic is from normally and if its lost out regionally?

Spinning content is okay. Don't use snippets, reword! Rewrite the content on your existing pages first instead of creating new ones.