The previous I'mNotRacistBut Party was UKIP (featuring Stephen Yaxley-Lennon as advisor for racially-charged issues, and denounced as racist 24 years ago by its own founder)
Before that the BNP was scoring a few percent in general elections.
And around and around it goes, all the way back to Mosley's blackshirts.
Of course, Farage himself may denounce such things:
> I set the party up, she was the administrator that got it set up.
( https://www.theguardian.com/politics/2019/apr/12/former-ukip... )
Which is an interesting contrast to his remarks when the party was being formed:
> This was Catherine's idea entirely - but she has done this with my full knowledge and my full support.
( https://www.independent.ie/business/brexit/the-new-ukip-nige... )
Friendly reminder that it's very easy, and very common, for racists to disavow their racism when it's expedient to do so (e.g. an extreme example https://youtu.be/zcoYKuoiUrY?t=1568 )