We booked the International Friends Tour from Southampton cruise port to Salisbury, Stonehenge, and Windsor ending at Heathrow Airport post cruise. Their staff at the Cruise Port were organized, buses were on time and loaded quickly. Our guide Stephen provided us with a lot of information before we arrived at each site and told us how to maximize our time. It was a day well spent (8hrs approx) and very cost effective when one takes into consideration we visited 3 attractions plus were transported to Heathrow airport. The only downside was in order to meet the tour operator at 8:15 am we had to take our 2 suitcases and 2 overnight bags off the ship without assistance. Luggage isn't available in the luggage hall until after 830. I would have preferred a departure time at 9am.