OK yes, I should have used a reusable one, but I didn't.
I bought a cup of coffee on Brighton Station earlier. I couldn't see a bin on the train so I took it with me when I got off at London Victoria. I couldn't see a bin on the station so I carried it with me on the tube, still no bins, then another train out of London, still no bins. I looked after that cup for 3.5 hours until I could put it in the bin outside the station at my final destination 😆
Should I have just left it on the first train?