Without giving away any details, here's a summary of an email exchange with the good people at The Gadget Show:
I: So, you don't actually want me to do any kind of memory stunt?
I: Nor anything that would require me to know the difference between an iPod and an iPad, nor how to work a mobile phone, nor to know anything about The Gadget Show or its subject matter?
They: That's right.
I: And for an hour's work, you're paying me...?
They: Two hundred pounds.
And it's going to be great, too! I hugely recommend watching it, although it won't be on for several months (I'll remind you nearer the time). It's the first time I've been invited on a TV show to do something almost completely unrelated to memory championships! I'm a proper celebrity! And had fun filming it, too!
Anyway, now I'm going to St Louis, to be a laboratory guinea pig. See you all when I get back!