no more than 20% of the activities envisaged by the arrangement are intended to be carried out for reasons other than for the purposes of their public functions.
os mai’r bwriad yw na fydd mwy nag 20% o’r gweithgareddau a ragwelir o dan y trefniant yn cael eu cyflawni am resymau heblaw am ddibenion eu swyddogaethau cyhoeddus.