RAF Cranwell Graduation (1949)

Unused / unissued footage - dates and / or locations may be unclear or unknown.
RAF Graduation Parade in Cranwell, Lincolnshire.
M/S of RAF flag flying. M/S of the flag being raised as lines of cadets watch and we hear band playing a fanfare. The Duke of Gloucester (Prince Henry) arrives at the saluting base. Cadets present arms and English national anthem is played. Several shots of the Duke inspecting the parade with the Commandant, Air Commodore Beamish. The Duke escorted by Commandant returning to the saluting base.
Officer in charge of parade walks forward to Duke and salutes with sword. He walks back to ranks, and shouts commands. L/S of Cadets doing quick march past. L/S of slow march past. Duke in foreground salutes. L/S slow march past of the Colour. L/S of Cadets advancing in review order. They present arms as 'God Save the King' is played. Pan across saluting base to RAF flag flying. M/S of the Colour Party marching past the Duke. M/S of Duke and Commandant leaving saluting base.
(Comb. b/w)
(See UN 2157 B for Comb Neg)
FILM ID:2503.15
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[@fire5736]

Is anyone able to identify the first tune used for the march past in slow time? I would appreciate it if so.