Where can I buy Pipe Tobacco in London?

I have recently decided to take up 'pipe smoking' and have even brought a pipe. I just need to know if there are any affordable pipe tobacco retailers in london...

Any help would be much appreciated.
CONFUSION!!! how aptly named you are...If you want me to stop smoking then your just wasting my time and moreover, NOT answering the question. I don't care about your issues with smokers THEY ARE YOU OWN ISSUES, NOT MINE. Take your self righteous crap somewhere people actually give a damn. I know full well the risks of smoking.

Let me give you an example you can probably relate to. If you were to say what you just typed in person, you would be making a grave risk. Potential side effect include: Physical trauma, broken nose, other misc. broken bones. Dire embarrassment. and well, I imagine it would put a downer on your day...