At least four tenders must be sought from competitive sources (You can advertise on the National Procurement website, www.Sell2Wales.co.uk.
Rhaid cael o leiaf bedwar tendr gan ffynonellau cystadleuol (Gallwch hysbysebu ar y wefan Gaffael Genedlaethol, www.gwerthwchigymru.llyw.cymru.