Dymunwn ddiolch yn fawr i Dr Brooks am ei waith trylwyr ar yr adroddiad hwn,  i’r Coleg Cymraeg Cenedlaethol ac Academi Hywel Teifi, Prifysgol Abertawe am gyllido a chomisiynu y darn hwn o waith.
We wish to thank Dr Brooks for his detailed work on this report, and also the Coleg Cymraeg Cenedlaethol and Academi Hywel Teifi, Swansea University for commissioning and funding this piece of work.