Cika jumla mai zuwa:
Janar yajin aiki, an gabatar da matakan rage farashin a duk ma'adanai, gami da samar da aminci. Gidaje biyar na gida - Westminster, Wrexham & Acton, Vauxhall da Gatewen - sun rufe cikin sauri a cikin shekarun 1920 da 1930. Mechanization, wanda ma'aikata da ƙungiyoyi suka yi imanin zai inganta yanayin aiki, ya haifar da ƙarin ƙura da fashewa, a cikin yanayin tattalin arziki inda gwamnati ba ta son aiwatar da ƙa'idodi.