Thanks so much for your advice, Pilot37. Yes, I received the awesome FT welcome on my first post

You are all so awesome and helpful. Apologies, crazy8534 reminded me I was thinking of GLA-LGW-MCO. Wow, you've found LHR-MCO flights? Tysm. I'll check to see if it pops up on the BA website when connecting. I do love LHR because it has a Harry Potter Shop and it's super easy to connect in.
Thanks for the heads-up about DUB. I didn't think of that. People like it because of the taxes and US pre-clearance iirc?