Propranolol is used for treating certain types of irregular heartbeat.
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In other words, he is using a generic drug that can be purchased in the UK but he is selling the US version in UK. This is a crime under the Act which makes manufacture, import, sale, supply, distribution, or supply of any such products with a view to their distribution within the United Kingdom a criminal offence under the Proceeds of Crime Act 2002.
Pricing and availability here -
How to do a bit of research to find the cheapest generics? any generic and Can zovirax tablets be bought over the counter check their price, look at the side effects (which generics may include more