I visited a friend in London yesterday and we did a nice tour of the microbreweries there taking in Camden Town brewery, Kernel, Brew by Numbers, Partizan, and the London Fields brewery. Actually, Kernel was closed (it was a Saturday) so we only saw the outside. These breweries all have tap rooms open at the weekend to sample the beer at the brewery. I don’t know if any of them brew at the weekend.
A great day out!