Didnt know BT owned Plusnet. How come there is a conflict in pricing then ?
Plusnet are normally a little cheaper than BT but you don't get the BT add-ons and, if you have BT TV, the Plusnet variant doesn't offer Ultra HD or some of the sport HD extra channels. They also charge for things like caller id which BT offer for free - subject to contract. Only you will know if any of this matters to you.