Hi
On 8th May 1945 Norwegian and British troops landed in Norway, followed on 13th May by Crown Prince Olav and representatives of the Norwegian government.
The Units involved were the 146 Infantry Division and the 1st Airborne Division.
146 Infantry Division included the following Royal Artillery units
69, 70, 71, 74, 79, 80, 143, 178, 185 Field Regiment, RA
55, 58, 88 Anti-Tank Regiment, RA
89, 118 Light Anti-Aircraft Regiment, RA
1st Airborne Div included the following Royal Artillery
1st Airlanding Light Regiment, Royal Artillery
1st Forward (Airborne) Observation Unit, Royal Artillery
The code word for the operation was Operation Doomsday.
Have not been able to identify the cap badge, the bottom part seems to be a hunting horn which is used by Rifle regiments
Hope this helps narrow down you search
neil