"do I just have to try and avoid accidentally putting a BBC channel on?"
You need a TV licence in the UK to watch television broadcasts, either over the airwaves on online by iplayer or commercial equivalents taht stream live.
To comply with the law, any tv you have must not be 'installed,' that is the aeriel socket must be unplugged and you must promise, Scouts Honour, not to watch iplayer.
In practice, there is little anyone can do to stop you. TV Licencing are not allowed into your home without your permission and you do not have to answer their questions.
The people who knock on your door and send you threatening letters are Capita, not the BBC. They want to sell you a TV Licence and make commission on it. They do not care about anything else.