We have two at work. Can't get pics though I'm afraid. They were used as gate guards until recently and in a pretty sorry state.
I just happen (as of yesterday) to have loan of a report on prematures in 25 Pounders in Malaya in 1955. Herewith a photograph of one of the four guns that were damaged.
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Thats been nasty,,were the prematures over a period of time or during one fire mission.