In 1993 in Canada, there was a Reform party that along with the BQ, split the Tories so much that the latter won only 2 seats. Though not as badly, the splitting was repeated in 1997, and 2000. Then they (i.e. Reform, renamed Alliance, and the Progressive Conservatives) merged. After that to present they were in government for about 9 years, over half as a minority. Presently 118 Canadian MPs are Conservative.
So if Canada is a guide, Farage might be replaced, then the replacement replaced by one maybe born in the early 1980s and one who will be compared to a Vulcan. Reform will merge with the Conservatives, and he will become leader, and will run the Conservatives for over 10 years. During this time, he will lead minority government for about 4 years and then a majority another for about 5 years; but all of this won’t happen for at least 10 years.
https://en.wiktionary.org/wiki/plurality
https://en.wiktionary.org/wiki/majority