Looking for suggestions on the most efficient way to visit London, Wales and Dublin (possibly Belfast as well) flying to/from Seattle, WA. Trip will be about 10-12 days total, so about 8-10 nights. We want to fly in and out of London-Gatwick because fairs are so cheap through Norweigan Air. We are open to train as mode of transport if it's only a few hours, but otherwise would probably want to fly to make the most of our time. Just not sure what the best order would be, or if train/plane is better.
TRAVEL TIME - end of May 2018 (is this a good time for these places?)