For Stage 1 and 2 participants this included the initial letter (standard and online versions), the standard leaflet, and the reminder postcard.
Crëwyd dwy fersiwn o’r llythyr, un ar gyfer busnesau nad oeddent wedi cwblhau’r arolwg blaenorol ac un arall yn diolch i fusnesau a gwblhaodd yr arolwg blaenorol.