I missed it last year as I went to Embedded World instead-definitely going this year though, but probably on the 12th. I always found stuff seemed to be packing up on the 13th and I don't like having to get there (out of bed) too early...
There always seems to be good exhibitors down there. Last time we actually found a second company in the UK who's making high quality PCBs & assembly, and that's harder and harder these days