We use BT for our broadband & have a BT hub number 4, we have no problems with wi-fi all over the house but i have built my daughter a studio in the garden to work in, problem is the wi-fi doesn't reach it, it's about 30 feet from the back of the house, the hub is at the front of the house & i can't move that as it's near the only BT socket in the house, there is mains supply off of the ring main in the studio. any ideas ?