incorrect because the speed upgrade site you refer to has nothing to do with the availability of the 300mbit service because it isn't an upgrade. The link you refer to tells you when the packages I referred to earlier can be upgraded and 200mbits is the highest upgraded tier atm. Homeworks 300 in a non-upgradable tier and has a separate site which is here
http://store.virginmedia.com/discove...homeworks.html. The area upgrade you refer to is an infrastructure upgrade (similar to them putting qam64 in place) so they have got the capacity in place rather than a "speed upgrade" by area which is what you seem to be getting confused with.