It is on in Manchester
It's a show with loads of tour companies, cruise companies and foreign tourist information people, covering pretty much the entire world. For some of the more unusual trips, like bespoke safaris, it might be worth visiting. I believe some companies offer deals as well, but we're talking about £100-£200 off a multi-thousand pound holiday rather than amazing bargains. Free tickets to this are incredibly easy to come by - I think last year I had three pairs of complementary tickets from various sources. Ultimately, I wouldn't recommend making a special trip to the show - if you're going to be in London and can spare a couple of hours, then it may be worth a look, but the result is likely to be that you'll pick up loads of travel brochures that you'll hate carrying around and probably never look at again.
Has someone previously been to it ? How is it ? What do they do?
Would go to this but I now limit any travel into London as an emergency only situation. I am now prepared to spending a few quid more on the trains to avoid going via London.