Wow, six of them are actually in step! (Our servicemen couldn't manage that in the Olympics Opening Ceremony!)
Returning to the Irish helmet subject - They also tried a small batch of Adrians before adopting the Vickers pattern. As for the phasing-out of the "coal scuttle"...at best there would only have been ~8,500 or so of these anyway...the size of the pre-"Emergency" peacetime Irish Army. The Irish Defence Forces swelled greatly during the "Emergency" however - and these were IIRC the first to be equiped with battledress and helmets sourced in the UK...there being some considerable status attached to the core "regulars" and their retaining their pre-war issue as long as possible But by the end of the war British pattern battledress had become universal - whether in wool (for the regular Irish Army and Reserves) or in brown denim for one of their (three) home guard forces.
Just looking back quickly at the very first post in this thread... ....I didn't click on it before and I don't need to now - for those of you that have it it's the pic at the bottom of Page 15 of Osprey's "The Irish Defence Forces Since 1922" by that highly accurate description! The epsiode is indeed captioned as "1939" in the Guide. The soldier is described as wearing the "M1924 uniform" and the "M1928 helmet".
In 1927 the Irish government ordered 5,000 stahlhelms. These were actually made by Vickers with the interiors supplied by a Dublin firm. They gave the Irish army a very Germanic look. In 1940 they were replaced with British helmets.
Note I posted this to illustrate a point in a thread about the Chinese use of such helmets and the mods have moved it which vitiates the whole point