Caiff y gwasanaethau hyn eu cynnal mewn tri rhanbarth mawr, sef: Y Gogledd, y Canolbarth a'r De-orllewin, a'r De-ddwyrain.  Bydd lle i weithio ar lefel is-ranbarthol hefyd fel rhan o'r grwpiau mwy hyn.
These services will all be undertaken in three large regions: North Wales, Central and South West Wales and South East Wales.  There will be scope for sub-regional working as part of these larger groupings.