<<< I am wired up and paying for 2 Meg Broadband from Virgin, but my connection speed is only displaying 100Mbps (I presume this to be 1 Meg broadband?) >>>
The speed of 100Mbps is the speed of the network connection between the "Local Area Connection" and the Modem/Router - it is running 50 times faster than your relatively slow (in networking terms) 2Mbps broadband service!
<<< I have had my line speed tested, which showed 192Mbps >>>
A 2 Megabits per second connection (2000 kilobits per second) is equivalent to 250 kilobytes per second so, on that basis, if you are getting 192 kilobytes per sec that, depending on internet traffic generally, is not too bad.