TBH at the mo, at £40 a pop, I will put up with what I got, or just replace the Magenta unit. Colour printing seems okay and for multigrade I will use the under the lens filters. These filters are EXPENSIVE its a half inch square of glass with posh coating and they want £40 each! I'll get my felt tips out and make my own, when they fade I just put some more ink on them.
Anyhow, rant off, I have email KHB and see what they come up with. I know in the UK we get screwed on price so fingers cross they might come up with something more realistic, but if its gonna cost me £150 to replace these baby's then I'll buy an Ilford 500 multigrade head off of ePay for the same price instead. Na stuff it, stick with the Ilford toy ones that go under the lens.
Anyway thanks guys for all your help, going to have a play tonight with my colour analyser and see how they compare with the Ilford toy jobbies just to see how faded they really are, grade FIVE here I come!