HarrowBrewer
Regular.
This may be known already, but I was sent this from a friend, and I have no connection to it, this post deals with Watneys Red Barrel, the whole blog has some great stuff on it.
http://boakandbailey.com/2014/09/brewing-red-barrel-watneys-keg/
http://boakandbailey.com/2014/09/brewing-red-barrel-watneys-keg/