Yn yr un modd â'r mapiau ar gyfer tomenni categori C a D, mae'n bwysig nodi y gall y set ddata newid oherwydd y rhaglen waith barhaus yn y maes hwn, gan gynnwys y rhaglen archwilio dreigl, a all ganfod newidiadau mewn ffiniau neu arwain at newidiadau i gategorïau  tomenni segur.
As with the maps for category C and D tips, it is important to note that the dataset is subject to change due to the ongoing programme of work in this area, including the rolling inspection programme, which can detect changes in boundaries or result in changes to the categorisation of disused tips.