The way Brexit is unfolding, all of the sounds coming out of the Tory party at the moment suggests that we will ultimately accept free movement of people and contribute to the EU budget in return for a semi decent trade deal.

That is clearly going to piss off a lot of people, who were voting for controls on immigration or not giving the EU £350m a week.

As it unfolds I would expect Farage to accuse the Government of betraying the people and consolidate ukip support in areas where these factors have been the strongest drivers (and who can blame him).
Many if these areas like northern cities and the valleys are traditional labour strongholds and labour could be under real pressure if they don't play this correctly.