BT Infinity with Cisco Router

I recently setup BT infinity with a Cisco router, I was using the Openreach modem to terminate the vDSL connection and then the LAN port from this modem connected to the port on my router (Interface GigabitEthernetX)

The configuration required on the router side was pretty straight forward and can be seen below. No password is actually required and you can send any string, I used '1234' and it worked.

interface GigabitEthernetX
description **WAN INTERFACE TO OPENREACH MODEM**
no ip address
duplex auto
speed auto
pppoe enable group global
pppoe-client dial-pool-number 1
no cdp enable
no routing dynamic
!
interface Dialer1
ip address negotiated
no ip unreachables
ip mtu 1492
ip nat outside
ip virtual-reassembly in
encapsulation ppp
ip tcp adjust-mss 1452
dialer pool 1
dialer-group 1
ppp authentication chap pap callin
ppp chap hostname [email protected]
ppp chap password 0 1234<
ppp pap sent-username [email protected] password 0 1234
no cdp enable