Nope. Never been.
I mean, I find with any kind of thing like this, the UK doesn't do it like other places. Like it won't be NAMM. and the BVExpo I went to today wasn't like IBC (Amsterdam). Different scale. Different cross section of exhibitors etc.
The real reason I'm tempted to go, is because I'm planning on putting a little something into production and it might be a good chance to see what these things are like, should I ever want to exhibit at one. I imagine quite similar to broadcast things I've been to.
I tried to have a look through the exhibitors. I might find something interesting there but I'm not really a big gear head. I dig amplifiers. I can't be that bothered looking around at 300 different versions of a tube screamer from different manufacturers. I'm just thinking it might be a good bit of research...