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I realise this answer is quite late after the original question!
Having been baffled myself, I spoke to Tesco's Head Office (0800 50 55 55) who told me "Tesco Upt" stands for "Tesco Unmanned Terminal" at their petrol stations. In my case, all transactions are genuine but the term seems to be causing alarm for others ('Google it!). Obviously, unmanned termminals are a risk as they are attractive to fraudsters who have cloned cards, so to be sure you know which transactions have been made by you, always get a receipt or make some sort of note when you do use them to reconcile your statements.
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