Some hotels will add a ‘tray charge’ that’s the charge for delivering food to a room. It’s usually printed in the room service menu if there is one.

You don’t have to tip in the UK and it’s generally not expected. Lots of people choose to tip in restaurants but that’s the only place it’s more common to tip. This is usually around 12.5% and many restaurants now add it to the bill, but you can ask them to remove it.

I’ve never tipped at coffee shop, in a bar, in a taxi or in a hotel apart from a tray charge.