I thought they arrived at the conclusion that Crosland 638 were the correct filter - Crosland 638's are certainly the ones they sell via the P5 club shop anyway.
Unless of course there are some rouge 638's of a different size in circulation. Not impossible.
I've just bought one of these Crosland 638 filters from Ebay. It fits but is a little different in size to the original filter. It looks like it'll still do the job though
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