Sky admit it's engineering issues on their core network, relates to the Alcatel Broadband Network Gateways, SR 7750s, they are terminating the PPPoE sessions on I believe.
Except Sky doesn't use PPP on their fibre products. Maybe ETHoA, or IPoA or whatever its called, but you just need a modified DHCP client connected to the Openreach modem, and in your DHCP client options you provide the userid/password pair.
James BT Infinity 2 19/09/2012 - Speeds 49 / 8.2 Mbps - Sync 53 / 9.5 Mbps @ 470m
Huawei modem -> RT-N66U -> Switch -> PC/Mac/Linux/NAS/Phone/TV - last speedtest
13 years of broadband - 1999 ntl:(512k/1M)/BTbusiness(2M)/Metronet(2M)/Bulldog(8M/16M)/BE(19M/16M)/BT FTTC(46M)