One respondent suggested the National Sector Schemes (an alternative quality management certification to work on the UK road network) could be opened up in a similar way.
Awgrymodd un ymatebydd y gellid agor y Cynlluniau Sector Cenedlaethol (ardystiad rheoli ansawdd amgen i weithio ar rwydwaith ffyrdd y DU) mewn ffordd debyg.