Best Shampoo and Conditioner for Dandruff?

I suffer with bad dandruff but since I have been using lush products it has seemed to have helped alot, much better than head or shoulders etc

Squeeze half a lemon and add a bit of water, rub in generously wait for 30-min to hour and wash off, does the trick everytime and its costs virtually nothing, Just make sure you don't have any grazes or cuts on your head