Mae gwaith pellach yn cael ei wneud ar y pedwar syniad – bydd un yn cael ei gynnig i Lywodraeth y DU yn y flwyddyn newydd i brofi system Deddf Cymru.
During the visit to Ysgol Eirias, the Finance Secretary watched a short film made by year 10 pupils about why they believe a plastic tax is needed in Wales. He also  discussed the other three tax ideas with them.