I see that this topic has come up before, but most of the responses are at least a few years old, so here it is again:
We arrive at the Southampton cruise terminal on Sunday June 18, and would like to take public transportation to a London Heathrow hotel, where we spend the night before our return to the U.S . A side trip to the highlights (Stonehenge, Windsor) is also OK, since we have the whole day. We have seen these sights before so it isn't critical that we visit again -- but sightseeing is probably better than sitting in an airport hotel all day!
Is public transportation easy, or are the private bus and shuttle services more convenient and worth the extra cost?
Thanks!