yes Reciever crystals swap out to prevent overlaps of frequency. I use a selection from 40.675 to 40.975. RW specify a minimum of 3 sets, and you have to be able to swap them quickly.
The crystals are simple push fit affairs, and you need a matching Rx Tx pair, costing about £10. Radio gear can be swapped, but its not inexpensive to use only if you visit the UK, though when added to the cost of shipping to the uk, travel etc, I guess it comes out pretty minimal.
I would be more concerned about bringing over a crated machine,swapping the radio gear and running it without proper set up.

removable links are easily steadied with a little tape on one side, this isnt enough to stop the link being pulled if it needs to be, but does stop things rattling loose.

Killercarrot is a robot (slaps back those who would argue the point), and was aired last week, heat F, where we drove badly, but lost well.
Its been said before killercarrot flies well
piccies of the carrot if you follow links on the worthing live event section (its the orange one).