No I don't think there is any evidence of Government W/NGs being fitted with sidecars during the war?, there is a picture of the Exeter Home Guard with an Ariel VB SV fitted with a local manufactured sidecar but I doubt the Home Guard who were issued with W/NGs on temporary loan on occasion would be allowed to make alterations to them.
OK, I get it.
Mostly I am interested in fitting a sidecar to one of my Ariels to get grandchildren interested in vintage motorcycles.
I am building a 1940 VG that would be more appropriate.