Definitely sell and rebuy the monitor. Few monitors are multi-voltage, and UK electrical power is 240v, 50Hz rather than the 120v, 60Hz of US wall-outlet power. The computers may have multivoltage power supplies, in which case all they'll need is new power cables, but BE VERY CERTAIN to switch them from 110/120v to 220/240v before plugging them in, or there will be ugly crackling noises and large embarrassing clouds of expensive magic smoke.

The DVDs are easy. They're low weight and low bulk. Box'em up and ship the boxes as freight.