We will be staying in London for 2-3 nights post cruise out of Southampton on October 1, 2024. I would suggest a possible excursion would be to take your group to the Harry Potter Experience just outside of London. We did it last year (hadn’t seen but 1 HP movie) and surprisingly enjoyed the day there. We went to buy Christmas gifts for our grandkids and we have decided to go back this time and enjoy the day now that we’ve seen all the HP movies and understand the stories.