Has anybody else had the same problem, and is it possible to get Sky to do anything about it?
Sounds as if they are on the Sky Connect service, and if so probably paying £17 a month for it.
Connect is a very poor service as Sky are renting capacity from BT to connect users in exchanges Sky haven't yet unbundled. Sadly BT's prices are high, so Sky aren't renting enough capacity so you get a lot of congestion issues.
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)