The link for UK residents is
https://www.saneftolling.co.uk/The French site only covers Belgium, France, Germany, Luxembourg, The Netherlands, and Switzerland.
Unfortunately for me the only system available to cover Italian residents is for heavy transport

PS. I had a moment of hope with Vinci Autoroutes but then this popped up: "In order to subscribe, thanks to provide a statement of account from an account open in a french bank or a foreign bank having at least a banking house in Metropolitan France or in the Principality of Monaco."
I will have to check further.
PPS. I just found in the FAQ of Vinci Autoroutes:
"Disposer d’un compte bancaire ouvert auprès d’un établissement bancaire situé dans l’un des pays de la zone "Single Euro Payments Area"(ou zone SEPA).
Résider dans l’un des pays suivants : France métropolitaine, Monaco, Allemagne, Belgique, Espagne, Grande-Bretagne, Italie, Luxembourg, Pays- Bas, Portugal, Suisse."
Which, if I understand correctly means:
"Having an bank account with a bank located in a country of the "Single Euro Payments Area" (or SEPA).
Reside in one of the following countries: France, Monaco, Germany, Belgium, Spain, Great Britain, Italy, Luxembourg, Netherlands, Portugal, Switzerland."
Which probably means I can get one of their tags. I'm going to give it a try anyway.
PPPS. (how many post, post scripts can you have) It seems to have worked. In theory I should receive my tag on Wednesday. Hope it arrives because we leave first thing Thursday morning. I'm not too worried if it doesn't because we are often in France, next time will be September.