Simon was the author of the report, Second homes: developing new policies, that was commissioned by the Welsh Government in order to consider possible interventions in relation to second homes.
Simon oedd awdur yr adroddiad, Ail gartrefi: datblygu polisïau newydd yng Nghymru, gafodd ei gomisiynu gan Lywodraeth Cymru er mwyn ystyried ymyraethau posibl yn y maes ail gartrefi.