More recently he has been a member of challenge panels or advisory groups for Government plans on high-speed rail, eco-towns, transport appraisal and the Local Sustainable Transport Fund.
Yn fwy diweddar, bu'n aelod o baneli herio neu grwpiau cynghori ar gyfer cynlluniau'r Llywodraeth ar reilffyrdd cyflym, eco-drefi, arfarnu trafnidiaeth a'r Gronfa Trafnidiaeth Gynaliadwy Leol.