Few want Corbyn as PM
A massive swing to the left under Labour's leader Jeremy Corbyn is not popular with many in the UK. Take a look here to see Labour leader's Corbyn favourability tracker. Negative -50 apx.
If there was a Lib Dem and Labour alliance I could see that being the pathway to a second referendum and GBP strength. Polls shows that a second referendum would result in a remain win. However, this headlines rules that out for now.