I was recommended the John Frieda Red Boosting one but found it very drying and I don't think it actually did anything to preserve or enhance the colour.
Has anyone found a really good colour enhancing shampoo that keeps their bright red hair colour looking vibrant for longer? My hairdresser recommended Bleach of London but from looking at their website they don't seem to do a red shampoo, almost every other colour under the sun though!