u/Fabulous-Day8651

Hello! I have a pretty long layover in London on my trip to South Africa and I was wondering what are some budget friendly things to do or if you guys think I should stay in the airport. I am supposed to land in London at 9:25am and my next flight is at 7pm. I don't really travel internationally too much so I am not familiar with how long the TSA lines could be or going through immigration or things like that. But its a pretty long layover and I feel like it could be a waste spending it entirely at the airport so any ideas would be awesome, thank you!!