I would interpret the trend as people tactically switching from the small parties to the main 2, with Brexit Party completely collapsing and Tories picking almost all of them up, while Lib Dems are also on a downtrend that is mirrored by a Labour uptrend, probably the issue of splitting the vote. Very surprising poll regarding class, but might be due to inclusion of pensioners as working class, and the working class leave vote going Tory. And Corbyn doing terribly personally in all polls. All pointing towards a significant Tory majority.
Brexit Party down is the main story, as you say. Farage does seem to have the ability to whip up support when he goes on the attack though, which would skew the Con/Lab split once again one way or another, I'd have thought. If he still has the enthusiasm for it he once had, which is starting to look a bit doubtful.
I can't believe people still go on about class. Is a train driver on £70k+ a year working class? Is it money or education, when we're set to have millions of graduates on average salaries or less? How many people in the south east are going to inherit the best part of a million, or more, when they sell their dead parent's house? Do they suddenly become middle class if they weren't before. It's bollocks for me.
edit: sorry, the Tory lead is really the main story, as you conclude.