See GE results 2010, 2015 and 2017.
1. When LD do well YOU do badly.
2. When UKIP/BREZI/YORKIES do well, the TORIES suffer, LAB is OK.
JC's hard Brexit policy is boosting LD. (see 1)
If Brexit happens, the BREZIS disappear. (see 2)
Join the dots, Caroline.
A) JC switches to remain and you get back the Labour defectors from LD / GRN... plus a few Tory remainers.
B) Brexit is cancelled, so the Brezis don't disappear, but hang around cannibalising half the Tory vote.
Wake up, wise up, GTTO.