I don't think you…
Submitted by alan h on Tue, 08/18/2020 - 14:17I don't think you necessarily need to non-stop through France on the way to italy, only on the way back to the UK to avoid quarantine.
Don't think there are any restrictions on entry into italy from France or Switzerland
Ceck this page , day by day …
Submitted by Ugo on Tue, 08/18/2020 - 14:43Ceck this page , day by day , for the Entrance in Italy
https://www.esteri.it/mae/en/ministero/normativaonline/decreto-iorestoacasa-domande-frequenti/focus-cittadini-italiani-in-rientro-dall-estero-e-cittadini-stranieri-in-italia.html
at the top right of the page, the key to change language !