Most things went well (see senior moments) until we got on to the M27, leaving Southampton. Louise had booked an overnight caravan within easy reach of Brittany Ferries - within 15 miles or so. Easy for us to make it by 0700. Except the satnav was routing us to the Isle of Wight. Booking.com had found us somewhere within 15 miles, but it was overseas. Went to Portsmouth instead and had a great stay at Holiday Inn. Louise is in complaints mode where she won't let go.
The message is to book direct. Our difficulties up in Hadrian's Wall were partly due to booking.com.