British Go Association rules
Current Rules (2008)
On 20 October 2007, the British Go Association decided to adopt the AGA Rules. This decision was unanimously approved at the 2008 Annual General Meeting, as reported via the BGA's gotalk mailing list.
Earlier Rules (pre-2008)
The default rules used at British Go Association events are Japanese Rules except that Triple Ko is a draw, not a no result. See http://www.britgo.org/rules/approved.html
RobertJasiek: Wasn't there more? What about no Both Players Lose rule?
LithiumTwo: There is a Both PLayers Lose rule, but as it is mutally exclusive to another rule, the BGA maintains the right to decide which one to rule in favour of.
Is this really a distinct ruleset? It sounds more like a Well we don't have enough time to let people replay their game and if they do it will mess up the draw practicality to me.