I have a plastic insulated cup for my coffee in the car or on the train. Keeps it hot for hours. I’m not sure if you can get this particular brand in the UK but there must be something similar.
Whether this is for safety reasons or to stop people smuggling in alcohol, soft drink bottles surely pose exactly the same threat. If they stop all liquid containers this would have a huge impact on parents who bring children. The cost of supermarket drinks are a fraction of the cost of the...