Anyone in UK know why Virgin have not sorted out cable in Tadley?

Yes. Simple answer is money. Cost of digging, laying and installing cables to expand their coverage is not considered cost-effective. This is a particular problem for outlying areas as the costs would be weighed against the possible revenue from catchment in that area. Thats ultimately something which will affect all such services to those types of area. BT are generally ok as they've had telephone cables everywhere from very early on and ultimately those lines are rented by the other media companies. In many cases there are large towns within easy driving distance, but the costs involved in spreading to the smaller areas outweigh the perceived benefits. In some cases the costs are particularly high due to the landscape and protected land they would need to cross/dig.