Well, I've answered my own question!
From reading other forums, it turns out that Vodafone UK has switched most of its 3G coverage away from the 2100MHz band (which the Kindle supports) to other bands that the Kindle doesn't support.
Bit disappointing, but the 2G still works at least, and 3G will work outside of the UK (which is one of the main reasons I got the 3G model).
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