One suspects that what we are currently seeing from Boris and Farage is the laying of markers: here is where the negotiations, which will certainly take place in private, commence.
There is a troubling theory that Farage is determined to see Corbyn elected, since this would guarantee a further delay to Brexit and another referendum, creating yet more frustration and extreme anger amongst Leavers, which would serve to keep Farage a) relevant and b) in a job.
I really don't want to believe that.