I think the only way to fix that would be to darken the yellow to the point where it's not really perceived as yellow anymore though - more like a muddy mustard.

edit: op originally specifically referred to yellow.

Yeah, the purples look very close on my screen

It looks quite fantastic on my fairly new OLED screen, and the colors are pleasingly differentiated here.

Obviously designing for bad screens and/or eyes are both very important considerations, though.

Yeah and it's essentially lacking a red

I thought the colors on the linked 'National Grid: Live' page looked pretty good, but they don't match the palette. For instance, the red used is #c45.