In my case I didn't even notice high latency really, the DSLAM was just straight up dropping packets at peak times and the ISP's didn't seem to know about it, BT claimed their SVLAN utilization rate was 20% and that there was no congestion issues. It was only Openreach who monitored the DSLAM and found an issue after I contacted them.
Email the CEO with the reports at different times of day and explain to them that Sky will do no more and that you have had engineer visits to check your line. It then puts it on them to find out what's wrong, especially if Sky is saying they are not having congestion issues at the SVLAN. Might be worth getting Sky to check their SVLAN reports for congestion first.
My guess is that the reason they won't offer people the 80/20 is due to bandwidth issues at the cabinet, the new Ofcom rules mean ISP's can only advertise average speeds, that includes peak time congestion, so if the average is lower then 70, they just wont offer the 80/20 package. Most of the cabinets still work off 1G links for 200-300 connections. Even a maxed out cab with a 6G fibre link back to the exchange only gives a guarentee of 20mb. You only need 50 or 60 users to be downloading a game at the same time to fill that bandwidth. So a speed drop from 80 to 50 wouldnt actually take much if the cabinet fibre links are low or the cab is full.
Edited by scott88c (Sat 12-Sep-20 13:27:04)