Best shampoo and conditioner for platinum blonde hair?

I have bleached/platinum blonde hair and am looking for a good shampoo and conditioner set to try and stop the brassy look! Can anyone recommend anything really good? I'm in UK by the way! Thanks!Best shampoo and conditioner for platinum blonde hair?
I'm not from the UK but any product made for grey or platinum hair will have some purple tone to it, this gets rid of the brassy yellow that can happen and keeps it bright. However, sometimes even using it full strength is too much and can leave a purple deposit on your hair in parts especially if its over processed. In this case I find the best thing to do is to use a shampoo for highlighted hair and pour some (maybe just under half the amount) in your hand mixing together and then there is maximum brightening without purple hair. Some professional lines make beautiful conditioners with purple undertones that aren't as strong as the shampoos such as Redken 'pure pearl'.Best shampoo and conditioner for platinum blonde hair?
Nothing with Henna (henna is for red hair)


I like to use coconut scented products.


Lemon Juice and vinegar are good, natural ways to keep that platinum look, just make sure you use a good conditioner cause your hair will dry out fast.
Garnier Fructis if they have those there...????