My understanding is that this was organised by Dave Gibbons. Basically it is a brief history of British comics, and touches upon the wider US success of initially underground British creators. Particularly reoccurring are Alan Moore, Dave Gibbons, Garth Ennis, and Grant Morrison.
I wouldn't go out of your way to go to this, but it's certainly worth a look if you're in or around London and passionate about comics. It's unlikely to teach you much you don't already know, but it has some interesting curiosities. It does delve back a few hundred years to things and how they helped form the seeds of what became comics in more recent times.
Some of my personal favourites were seeing original artwork to things like V For Vendetta and The New Adventures Of Hitler. It's nice to see the almost collage like approach to the way the artwork is built up in multiple layers.
Also there is a couple of original pencil Frank Quitely covers. The cover to Batman & Robin #7 in particular was interesting to me, because I always found Quitely a bit too heavy with the lines in his artwork. But the cover to B&R#7 really was quite impressive, it was a whole lot less oppressive without the heavy inks. It gave me a fresh opinion on his artwork, I'd like to see more of his work without inks.
Of humorous note to me was the curtained off 'sexual content' section. Mostly it was funny because the pages shown for display seemed to be some of the least explicit examples they had example. I think they would have struggled to even find a less explicit page of Lost Girls if they'd tried! Ha ha.
It's taken me a while to get round to going, and anyone who doesn't go shouldn't feel like they're missing out on anything essential. But if you're in the area, give it a go and you'll likely find something to enjoy!