I consulted my friend Bert Lindeboom and he gave me some pointers, which helped me in my search.
AOS "338" denotes 98th (Surrey and Sussex Yeomanry, Queen Mary's) Field Regiment, Royal Artillery. This unit served in Italy until it was attached to 21st Army Group fighting in North West Europe. So it was sent to Belgium in March 1945, and was re-equipped with Sexton 25-pounder SP guns. It was attached to
1st Canadian Armored Brigade, which supported both the 1st Canadian Infantry Division and the 49th British Division in the closing battles of the war in western Netherlands.
Reportedly, they moved to Germany before the end of WW2. I suspect that either a few units remained and/or came back to the Netherlands for the liberation parades.
Movements (
source):
Mar 45 - Menin, Belgium (from Italy)
Apr 45 - Dunkirk, France
Apr 45 - Duiven, Holland
Apr 45 - Huissen, Holland
Apr 45 - Dodewaard, Holland
In April 45 the Regt moved to the Lubeck area of Germany as occupation forces.