Around 1923 British Light Cruisers would have been Weymouth, Chatham and Birmingham Class ships.
Distinctive features of these ships not present in the ship pictured:
Fwd and aft funnels were smaller than the midships funnels.
Single, large throated hawse hole on port side.
Fire director on tripod above bridge.
I think that Boudicea class ships were out of service by this time. So the date might be a bit adrift.
German Magdeburg class light cruisers were similar...?
A little research and I think that the scout cruiser may be a Novara class cruiser of the Austro-Hungarian Navy.
either SMS Novara or SMS Saida or SMS Helgoland (1912).
Of three in the class two went to Italy and one went to France in 1920.