Oh your right Bear. That is a bit worrying. I just went to the Excel site to check and MCM Expo is the only scifi show listed in october. Maybe excel just haven't updated the page yet.
This is typical Shamasters, I'm afraid. Earls Court never know anything about LFCC until about a month before the event. This has been happening for a few years now. Yet you make any mention of this on their forums and you get the mods on there calling Earls Court incompetent for not updating its website. The truth is that Shamasters haven't made the booking. I'd hoped Media 10 might have made the booking, but there's no evidence of it so far.
If someone else decides to book Excel on the weekend of Trek, I wonder what would happen? Given the behaviour of Shamasters over the years, I'm sure there are one or two organisers in the UK who'd like to do some damage.