Hi ProfessorM. I too am going to France this year and have had the same ‘tyre’ thoughts. I don’t have a rack so my plan is to use tyre sealant, have a ‘flexi’ return ticket so that I can delay my return should I have a damaged tyre, an internet enabled phone so that I could contact one of the four Morgan dealers that Google says there are and have them express deliver a tyre to my location and of course a credit card. A tyre inflator might be useful but not having a cigar lighter plug in is a bit of a nuisance. I have used Bikeseal in the past and bought Air-seal this time as the 950mm bottle is a more cost effective way of buying.
www.BIKESEAL.COM. WWW. AIR-SEALPRODUCTS.COM