In reply to Tall Oak:
Hi,
two local to me are the GR54 the tour of the Écrins national park, there is a new guidebook in English by knife edge outdoor guidebooks, it is really good done in conjunction with the national park, and tells you everything you need to know options for splitting the days if you want to do long day and shorter over all time or the other way around. That said the GR54 is a tough GR route really worth but may not be the best option for first time alps walkers, kind of depend on how much experience you have in the uk?
https://www.knifeedgeoutdoor.com/store/p1/ecrins-national-park.html#/
the other option is the Tour de Queyras, the Queyras regional park is a walker paradise, a easier tour over all, with lots of options, it will also be a lot quieter than many of the GR route, with things like the TDMB being a bit of a motorway depending on when you do it. kind of depend on what your after. This site has some good info on it (in french stick it in google translate) https://www.tour-du-queyras.com/
and cicerone do and English guide book - https://www.cicerone.co.uk/tour-of-the-queyras-second