Serch hynny fe wnaeth Ms Williams alw ar y llywodraeth i gydnabod pwysigrwydd y gwaith sy'n cymryd lle yn ysbyty Cancr Felindre.

BBC: Dadl ar iechyd a gofal cymdeithasol

Fe wnaeth Llefarydd Iechyd Plaid Cymru Elin Jones hefyd gymeradwyo cynnig y llywodraeth i ariannu ymchwil ac arloesi mewn iechyd a gofal cymdeithasol, ond cytunodd gyda gwelliant y Democratiaid Rhyddfrydol ynglyn a chefnogi ymchwil cancr yn Felindre.

BBC: Dadl ar iechyd a gofal cymdeithasol

The Tory MP Alun Cairns had suggested to the company that they could locate within a Convergence area in Wales (the Felindre site north of Swansea, for example) which would have have delivered a greater financial boost on JLR's investment through Regional Selective Assistance.

BBC: Location, location, location