In such countries the immediate slogan ought to be 'For a centralised republic'. As for the UK, the monarchy provides modern British capitalism with its constitutional mainstay. Hereditary privilege is the very antithesis of democracy. Communists think we should exploit this for everything it is worth. Economist-communists think we should ignore or belittle it.
Fatal consequences follow otherwise.
As a good Marxist, comrade Delargy thinks that Britain, Germany, Australia, etc have already had their 'bourgeois revolution'. Democracy is deemed superfluous. In which case we might as well stick with the constitutional monarchy until the red dawn comes along. In the blue corner there is high bourgeois politics. In the red corner there is low 'prole' politics.