The document referred to is the Voluntary code of good governance for the sport and recreation sector,  published by the Sport and Recreation Alliance in 2011. The code was endorsed (on p3) by the then Minister for Sport and the Olympics Hugh Robertson.

The four points referred to in the original article are set out on p25 of the voluntary code.

You may also be interested in this section of the Sport and Recreation Alliance website: http://www.sportandrecreation.org.uk/smart-sport/voluntary-code