No, look at your log from when you were downloading. Try with the NZB again and watch your log.
EDIT: there's no ping reply from news.virgin.com, but there is from news.virgin.net. I have no idea whether this ISP-provided service supports binary groups, or what its rention might be, but most ISP services are crappy on both counts. In any case, you can also try playing with the 'Select group' and 'ARTICLE command' settings in Setup > Servers to see if that improves things (click APPLY and RECONNECT after changing anything here).