Yes, you may bring and eat cold food and drinks on board a bus (cold sandwiches, bottled water, candies...). For the comfort and safety of other passengers, hot food is not allowed on the bus. Note: Drinking alcohol is strictly forbidden on board.
People Also Ask
That depends on the bus. Most buses between cities in the US allow eating on the bus while most intracity municipal buses prohibit eating.
Hot drinks need to be in a travel-safe container, like a takeaway cup with a lid or a thermos. There are some exceptions: You can't drink alcohol on our buses. You can't eat or drink anything that will cause offence or upset other passengers.
TFL has a document published named the “TFL Conditions of Carriage”, which explains the house rules — no drinking booze, no smoking, no flash photography, no hoverboards (yes that's on there) — but there is no mention of food at all. Food is legally allowed to be consumed on TFL services.
Alcohol and public transportDrinking alcohol is banned on many public transport services in the UK. For example, consuming alcohol or carrying an open container of alcohol isn't allowed on: TfL services (buses, trams, tubes and Docklands Light Railway) in London. Scotrail train services in Scotland.
Either it is a walking tour or a bus tour, it is appropriate to tip your guide with at least one euro per person, depending on how long the tour was. If it was a bus tour, maybe you'll want to give one euro for the driver and one or two for the guide (it's best to give each their tip, as not always they'll be sharing).
However, if you're 16 or 17 and accompanied by an adult, you can drink (but not buy) beer, wine or cider with a meal. If you're 16 or under, you may be able to go to a pub (or premises primarily used to sell alcohol) if you're accompanied by an adult.
It depends on what you're eating. Discrete, low key snacking is fine as long as you clean up after yourself and leave no trace that your food was ever there. But eating something messy and smelly is probably a bit much. No not rude at all, but be aware of your travel companions and if your food smells bad to them.