27Yn adran 16 o Ddeddf Tribiwnlysoedd ac Ymchwiliadau 1992, yn is-adran (1), yn y diffiniad o “statutory inquiry”, ar ôl paragraff (b) mewnosoder— “but does not include an inquiry or hearing held or to be held in Wales under any provision of the Town and Country Planning Act 1990, the Planning (Listed Buildings and Conservation Areas) Act 1990 or the Planning (Hazardous Substances) Act 1990,