Thanks all. I have them booked into the Belmond Palace and they are arranging pick up and drop off back to the airport so hopefully that works well. They’ll make sure to leave plenty of time to get back to the airport.
BA have been extremely great trying to help with flights. The changes I’ve made have all been done painlessly so far. Being a third party nominee on the account has made the process very simple. I had look at the Heathrow assistance but I’m not sure if he fits into the drop down boxes. Thanks again!