Hello from another Market 1 victim near Maidstone.
I have previously looked at Vfast, but they did not cover my area, so now I had another look and they still don't !
However I note that the cost went up considerably, IRCC it was ~£15 p.m.
So, even if they did I would find it too expensive...
I don't think you need a dish, it would be some kind of antenna.
Meanwhile all I can suggest is switching your BB and phone to PlusNet (who are owned by BT),
yes, you will get some speeds / service, but at lest you would be paying less !
The only other alternative is Mobile BB, which does work well, but it's only economical for low usage - up to 3GB p.m.