has anyone in the UK ever had arcade parts/games/cabs even shipped here from the USA before?
Parts, yes. Cabinets no way. I've exported a couple of Bar-Tops to European customers from England, but I only do it if they arrange carriage as it costs a fortune, is major ball-ache with customs and are so likely to get wrecked in Transit. I've never imported from the USA, but why would anyone need to when we got the whole of the UK and western Europe so easily accessible by land?