> If Farage wins he is still subject to an investigation that could eject him from Parliament
He will win, of course.
But Parliament can't actually eject him. All they can do is enable the one mechanism that could: a constituency recall petition that needs 10% of his electorate to sign it, that triggers… a by-election he could lose.
If he runs and his constituency vote for him in that, he's their MP.
That is true, but while he is popular in his home turf, 10% is a low threshold for a figure as divisive as Farage, so seems pretty much inevitable, unless this pre-investigation-results by election kills the motivation.
Now would he win the second by election even with a finding of misconduct against him? He might very well. But the establishment parties (especially the Tories) will feel much better placed to challenge him if they have him being found to have conducted in dodgy behaviour.