Student Exchange Programs

Hello! I’m in the 10th grade and I was looking to be a foreign exchange student to the city of London in England, I’m sure you’ve heard of it LOL. I was wanting to go for the beginning of next school year, like from August to December and then start school here for January through May. Is there a safe way to do this? I’ve looked at SFA (I think that’s what it’s called) but they don’t seem to have England as a destination. Is there anyway you can help me? Thanks!