I recently dyed my light bleached blonde hair brown, it looks ugly. I want my blonde hair back, preferably without having to go to the hairdressers, its already faiding quite rapidly, do you think I could just buy a colour remover to get rid of the brown?

Probably. Or you could bleach your hair as well. Use lemon juice as a hair lightner. Soak and rinse. 3 times a week. Okay?
An easier way is to let it grow out
:)