First Day in the UK, tested the most casual thing I could think about. Your English Breakfast is awesome!

Just noticed you mentioned Tesco. I use Tesco's own brand oat milk for breakfast cereal. Confusingly, they have normal and long-life UHT oat milk. Get it from the fridge section, rather than the UHT stuff from the non-chilled shelves.

Trademark laws are written in a way that obliges trademark holders to be very aggressive against potential infringement, or they risk losing the trademark.