Hi Purdy, many thanks for your info, i’m so glad you are able to take advantage of the Nationwide FlexPlus Insurance, as you say it’s a great deal, I have also used their breakdown cover several times, and it has been excellent.
I am also older than you, 70 this year! I had not even thought about additional travel insurance, until Covid came along, I was diagnosed in 2019.
Your trip sounds fabulous, have a wonderful time, thank you for taking the time to reply. 
your trains will run smoothly, sure they will. Bon Voyage