Hi i think my flue has some how broke as the fire will not stay lit and i can feel a strong draught coming in from behind the fire via the flue. The fire came with the house and has served me well but i had to fasten it to the wall when we first moved in as it seemed the flue was taking the weight and i think this has done the damage. Can i fit the new flue myself as i am quite handy and how much is a new flue. The fire is a valor home flame.