Sky off-net broadband is amongst the worst possible, along with TalkTalk. They have to buy the BT Wholesale service and give that provision at their end a very low capacity. Congestion can be extreme.
As Apprentice advised, if they can get out of that part of the contract, they should, and go to almost any other BT Wholesale provider. Their connection speed may even be better from one of those than with Sky, and their user experience should be better.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site -
www.robertos.me.uk. Domains, site and mail hosting -
Tsohost.
Connection - AAISP Home::1 80/20. Sync 59999/14372kbps @ 600m. -
BQM