If you're a customer of PlusNet and they are your internet service provider (ISP), then you've probably been sent their standard wireless router the Thomson 585v7.
Plusnet provide two main services Value and Premium - they both come supplied with the same wireless G router. As it's wireless G it doesn't provide the strongest or fastest wireless signal available and really is an older technology.
So no matter what speed you should be getting from PlusNet there is an opportunity to make your connection quicker and more reliable by upgrading to a wireless N router. really is an older technology.