am thinking of renewing BT Sport can I add HD will it work on sky platform and what price will bt charge for HD, I am not interested in their other channels
HD can be added anytime and removed with 30 days notice, it's just an addon on a rolling 30 day contract. The cost is £6.50 per month, if you have a 2nd box subscription, HD on the 2nd box is included at no extra cost.
