Roedd y Comisiwn Brenhinol hefyd yn ceisio cryfhau ac amrywio y bwrdd, ac felly penderfynodd benodi dau Gomisiynydd newydd sydd ag arbenigedd arbennig ym mhensaernïaeth yr ugeinfed ganrif a threftadaeth forol, dau faes gwaith sy'n datblygu o fewn y Comisiwn Brenhinol.
The Royal Commission also sought to strengthen and diversify its board, and so moved to appoint 2 new commissioners who have significant expertise in 20th-century architecture and maritime heritage, 2 growing areas of the Royal Commission’s work.