And no it doesn't work the other way around just as well.
It did in Peterborough.
Hard to judge of the information we have as BP haven't stood in a GE, in 2015 UKIP was affected by the Tory promise of a referendum, 2017 UKIP was gone.
I suspect that is they go full bore that BP can pick up 20-30 seats.
Richard Taylor
"William Tell could take an apple off your head. Taylor could take out a processed pea."
Sid Waddell