A quick observation that you may have already noticed, the photo of your dad with his Royal Marine beret and cap badge is dated is dated July 27th 1944.
On his service record there is an entry that to me reads
HBL RM Training Group (W) 18th June '44 to 25 Feb 45
From Royal Marines Museum
RMTG Royal Marines Training Group (c1942-46) usually one of four camps In Wales
I don't know if the 4 camps mentioned, are the 4 below and the source of these camps names is not given.
Gibraltar Camp, Llanegryn Royal Marines Training Camp, Basic Seamanship
Burma Camp, Llwyngwril Royal Marines Training Camp, Seamanship and Navigation
Crete Camp, Barmouth Royal Marines Training Camp, Seamanship and Navigation
Towyn & Morfa Camps WWII RM Commando Camps
Is there anything on the back of the photos, perhaps a stamp of the photographers ?