Mae John Graystone hefyd yn aelod o Gorff Adolygu Cyflogau Annibynnol Cymru (sy'n talu £300 y diwrnod ar sail ymrwymiad amser o hyd at 25 o ddiwrnodau'r flwyddyn, yn ogystal â chostau teithio a threuliau rhesymol) a Chyngor Cyllido Addysg Uwch Cymru (sy'n talu £5,076 y flwyddyn yn ogystal â threuliau, ar sail ymrwymiad amser o 18 diwrnod y flwyddyn o leiaf).
John Graystone is also a member of the Independent Welsh Pay Review Body (remuneration of £300 a day for a time commitment of up to 25 days per year, plus travel and reasonable expenses) and the Higher Education Funding Council for Wales (an annual payment of £5,076 plus expenses, based on a minimum time commitment of 18 days per annum).