Just did this cruise in May. You will be off the ship in plenty of time. I think tou arrive in Harwich at 5AM. We opted to spend a night in England and do an early morning flight the next day. The RCCL tour of London and transport to airport hotels was only about $10 more than just the transport to the airport and was a pretty enjoyable tour of the city. There is also a great pub that will pick up and deliver back to airport hotels for those folks staying overnight. Check out www.oldenglishpub.com for a peek at what is now my favorite watering hole in the world.