Advice needed combining page ranks with PHP 301 redirect

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Can someone please help me out with this?
2 weeks ago I setup a 301 redirect using PHP from to =
Portmarnock has a google page rank of 2 while has a page rank of

My question is: Why have they not combined when I know Googlebot has
spidered those pages a few times? Is there a delay on things like

Thanks a lot,

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