If you're a customer of Virgin Media - 20Mbps and they are your internet service provider (ISP), then you've probably been sent their standard wireless router the D-Link DIR-615.
Virgin have provided a number of other routers at various points in time for their 20Mb connection. The current router is a variant of the D-Link.
Note these are all cable (broadband) routers and you do not need or want a modem router to operate with Virgin (as they will provide a modem). You should connect your virgin modem to whichever router you have. If you want a basic wireless router the D-Link is fine. If you want improved speeds/stability look at getting a dual-band router.