This is a question that I get asked a lot, and the answer may surprise you. While Tesco does not currently sell Tim Tams, there is a very good chance that they will start selling them in the near future.
Tim Tams are an Australian cookie that has been gaining popularity in the UK over the last few years. They are similar to Oreos, but many people say that they are even better. Tesco is one of the largest Supermarkets in the UK, and they are always looking to expand their product range.
There is already a strong demand for Tim Tams in the UK, and Tesco would be able to capitalise on this by becoming one of the first major Supermarkets to start selling them. I believe that it is only a matter of time before Tesco starts selling Tim Tams, so keep an eye out!
To answer the question posed in the title, it is highly likely that Tesco will start selling Tim Tams in the near future due to high demand and their propensity for expanding their product range.