Just that. Been using Vidal Sassoon 9/0 light neutral blonde for yonks. Roots are awful - can't find any for sale. Previously in Amazon, Boots and Home Bargains. None anywhere. 
Last time I tried a different colour it went pink and cost me £££s and hours of my time in a salon to put the mess right.
I'm doomed. 
Help me MNetters to find some please - my hair is cryig out for your collective help.