Many breweries will sell you kegs of beer direct, if you go for real ale you can tap the keg and let it settle then just pour it from the barrel with a tap peg:
http://www.lldesignclients.co.uk/clients/colinfarrar/uploader/pictures/Turn%20Down%20Tail%20+%20Tap.JPG
Try Fuller's, some breweries will even sell it to you as sale or return.
@Bobbo started
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Many breweries will sell you kegs of beer direct, if you go for real ale you can tap the keg and let it settle then just pour it from the barrel with a tap peg:
http://www.lldesignclients.co.uk/clients/colinfarrar/uploader/pictures/Turn%20Down%20Tail%20+%20Tap.JPG
Try Fuller's, some breweries will even sell it to you as sale or return.