I always found that any head and shoulders did not work on me at all. I tend to go for shops own brand and if you can get the menthol dandruff control one this works wonders.
Polytar which you can get from Boots is great. I suffer from psoriasis in the scalp and it really sooths it. I think it smells nice but it is an aquired smell. Its in a brown bottle.
Try african black soap - it's available from ebay and on websites that sell natural goods. It's amazing and totally pure and natural, comes in liquid or bar form. Not carcenogenic like some of the shampoos available in chemists.
I think the products containing coal tar are carcenogenic. Im pretty sure they are all banned in USA. I do use Nizoral and it helps but i only use it now and again.
Well I find Head & Shoulders works for me and another little trick is just at the hairlineI rub a little Nivea straight after washing, it is quickly absorbed and does not seem to affect the hair by making it greasy or anything.