Steps.....
Checked tyre but no damage seen.
Made up some soapy water. Poured into area where tyre meets rim. No bubbling.
Sprayed soapy water onto valve. No bubbling.
Sprayed spoke nipples. One showed bubbling so a leak.
1/4 turn tightening made it worse! Backed of 1/4 turn to original.
I've just resealed the small damaged area with matching black silicone, pushed into the tear and a layer spread over the area. Small matching dab put on at 180 deg opposite to help with balance but probably not necessary. Waiting 24hrs min for it to fully set.
Tyre was marked to be refitted as it was to aid balance so tomorrow/Friday I'll get it refitted. Photos to follow.

Plus Four MY23 Furka Rouge