Bring for people:
Atari ST SCART for Blackpanther
Atari ST, Atari Jaguar, 1084S adapter SCARTs for 1200xl
ZX Spectrum 128/+2 grey SCART for muguk
Return Jon's Densha-dai-go for the Playstation.
Mouse adapters and/or joystick adapters as I'm able to make them...360K 5.25" floppies with XT DOS games for Scarlettkitten
Dragon Scart lead, MSX Tape loading lead and Einstein Scart lead for Panther
MD2 SCART lead for billdooruk
Bring for RCM:
Jupiter Ace
Tapes for Jupiter Ace, and the only tape deck that will load them...
BBC Micro with Genlock and camera
Stuff to take:
A5000 from AndyT
DLT drive and tapes from stiggy2009
If I've missed anything, please let me know and I'll add to the list

-- Richard