Well that didn't work, still at 40Mbps and upload dropped to 10Mbps with the BT hub.
Configs tested:
* BT ECI modem -> Plusnet TG582N -> Desktop PC -> 40Mbps / 20
* BT ECI modem -> Plusnet TG582N (replacement) -> Desktop PC -> 40Mbps / 20
* BT ECI modem -> Desktop PC (PPPoE) -> 63Mbps / 20
* BT Huawei modem -> Plusnet TG582N -> Desktop PC -> 40Mbps / 20
* BT Huawei modem -> Plusnet TG582N (replacement) -> Desktop PC -> 40Mbps / 20
* BT Huawei modem -> Desktop PC (PPPoE) -> 63Mbps / 20
* BT Huawei modem -> BT Homehub 3 -> Desktop PC -> 40Mbps / 10
Not feeling confident a Billion router will resolve this.
Is there any difference in settings of the PPPoE connection from a Router than say Windows?