Two simple ways to keep up to date
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1 - Subscribe to the AIS site - there is more than just flight information/notams there. All AIC's etc are also available and IT'S FREE.
2 - Subscribe to the CAA notication service - AGAIN FREE - it notifies you of updates to a good many documents, charts etc and you are free to choose which items you wish to have notified.
Not being a member of a club, AOPA or any other flying organisation is not an acceptable excuse.