I have been told to use a toner to get rid of any brassiness.
I can get this from Superdrug or Boots I was told.
Is there only one particular type? which would you recommend?
Also it may sound silly but I'm worried of the purple colour the toner is!! because my hair is so dry and porous will it cling to my hair and tint it? I've had that happen before with a coloured shampoo!!

that should't happen as log as you don't leave it long literally apply and rinse, also try not to wash to often your hair will recover faster with help from the natual oils

You maybe aswell using a toning shampoo like aveda blue malva once a week to keep brassiness at bay. This is brilliant for keeping blonde hair uber fresh and vibrant. But you only need to use once a week to avoid product build up. x