I use semi-permanent hair dye but I also have a flaky scalp. I used to re-dye my hair every other week and also wash it with Head & Shoulders the day before I re-dye it because Head & Shoulders makes it fade but I want to re-dye it less often now, maybe every 6 weeks or every month. So does anyone know any shampoos or conditioners which fight dandruff but also don't make hair colourant fade ?
Any help would be much appreciated.

Head & Shoulders do a shampoo and conditioner for dyed hair.

I used it and it didn't make my hair dye fade. Not more than any normal shampoo would do anyway.

Thanks very much.
I'll try it. Was your hair permanently dyed though ?

I have dyed my hair permanently and i use head & shoulders specific for coloured hair and my colour lasts ages and have no problem with dandruff

loreal proffesional ( thats the ones from the salons not the shops ) do an anti dandruff shampoo which wont fade colour , hence its used in salons . you can buy it to take home , its £8.50 for 250ml but as its a professional product its purer than shop bought and will last you ages

Any shampoo will make hair dye fade-as will time even if you dont wash it.