I think Attack is planning on shaking things up by trying for a Labour platform in the next election that will create some fresh interest in that party and then explain it in narrative as expansion into new areas of the electorate rather than simply competing for the same votes with the Socialists in in the industrial working class sectors.
After all the NCP are hardly a party of the country, a large section of their party come from the urbanite ex British Nationalists and from (the 19th century equivalent of) suburban middle-classers that switch-hit conservative and liberal.
Labour should be expanding into the agricultural worker sector, the small plot farmer, and via the Methodist awakening forging an alliance between working class socialists and middle class Methodist evangelical shopkeepers and so forth. It's A. historically accurate to the rise of Labour in Britain and B. not that unlike the spread of Progressivism in America through the Social Gospel of Lutheran middle-class merchants and farmers in the Midwest as a parallel to their German immigrant brethren among the socialist working class of Chicago.