Within Wales, after the initial training all subsequent training is carried out by the utility companies in line with their own corporate policies.
Yng Nghymru, ar ôl yr hyfforddiant cychwynnol mae’r holl hyfforddiant dilynol yn cael ei wneud gan y cwmnïau cyfleustodau yn unol â’u polisïau corfforaethol eu hunain.