Just a warning for those planning on watching on the BT website or app.
I've watched dozens of games on there over the season and it has been fine, but the big games that generate a lot of traffic seem to bring some difficulties. I watched the semi final 1st leg on the website and there were a few moments in there when things buffered/lagged a bit. Also happened a tiny bit during the National League final the other day. I imagine the CL final will be the highest amount of traffic they get, so hopefully they'll sort whatever the issue is.