The problem with Restore Britain is that they're trying to carbon copy Trump's rhetoric to a country fundamentally different.
They will get some followers with their stance on immigration, but that's about it...
The UK is extremely dependent on resources and labour from outside its boundaries, but it does not have anywhere near the leverage the US has - the blackmailing techniques used by Trump on trade/tariffs, geopolitics and military, land acquisition have zero chance of success coming from Britain.
On top of that, the votes are already split between existing parties like Labour, Tories, Independent etc., unlike the democrats/republican binary choice and single endorsement of candidate, so much harder to get a lasting momentum.