Are British voters inclinded to mess with exit pollsters by giving false answers?
What exit polls?
Yes massively!
In this case, there are no exit polls because they were seen as serving little purpose with no previous data to use to balance them.
But it is known that people are less likely to tell pollsters that they are voting for the conservative side in the UK.
Just remember that the “Liberal” votes in the US always come in last as the disorganization and cheating is huge in those places. I find it hard to believe that anything would be different there.