I've had a few (non-railway) items on recently; and although a couple of people were slow, I got two/three who won items, and then informed me that they were overseas - despite the fact that my details quite clearly state "UK only". They got told to go away; but then you've either got to re-advertise, or offer it to the next highest bidder, which is all time-consuming (as if selling on e-bay wasn't already!), and more trouble than it's worth, given the relatively low value of most of this particular tranche of items.
Heigh-ho.