Email cablemystreet@virginmedia.co.uk and pray.
They're slowly expanding the network to cover gaps in the network, but it's pot luck if you can get service.
Your best bet is to email that address with your details and they'll let you know if it's possible. They have a maximum allowance they can spend per customer to get an install done, so if you can get your other neighbours that can't get it to also sign up you'd stand more chance.
Not exchange. Exchanges are a BT thing.
With cable it's the street cabinets. 150 yards is nothing really, they were probably fobbing you off.
If you were running too many devices they can always run another drop cable to your property.
Also, it's not necessarily fibre to the street cabinet you're connected to, often the network is split up so there's one optical node in a neighbourhood, which is then linked via coax to other distribution nodes, where you'll then be connected to.
Exchange, Cabinet, potaytoh, potartoh meh.....