LLoyds Chemists are the only outlets that I have found for your product on the high street. Their stock seems to be very limited to "Blended Tobacco" and "Crisp Mint". I found these to be fairly weak in flavour unlike the "Master Blend" and "Crushed Mint" which are firstly more expensive, and secondly, only available on line.
I also found that when fully charged, the pen did not last as long as expected.