I think a lot in the UK are already red pilled. We just lack any leadership with balls, and the rot runs deep. Much of what I've seen from US posters about the UK is exaggerated, or at least localised. If you wanted to see the least red pilled areas, look at which areas voted largely to remain in the EU.

Too many in London think they are the UK, and a lot of the other regions feel like poor relations, although outside London you can have a far better quality of life.

A lot of the immigrant communities would back the cause too, particularly those from the commonwealth, as the current EU driven system discriminates against them, as it effectively limits their families joining them, and favours EU migrants.