Deffo Artillery and deffo post war....
The top one has him in what looks like 1947ptn (poss 1942ptn), but after the war (initially from late 1944) as the collar is open, has an officer style tie and attached collar....
The second one...1949ptn uniform, very shiny boots and brasses...The tentage smacks of the TA though...Although with National service and post war, I expect an amount of "emergency accommodation"!