3 kms from Glenlivet Exchange with I understand ADSL speed up to 7Mbps. Achieving 5 to 6 Mbps weekdays until 4 pm when as though a switch has been thrown it falls to about 1.2 Mbps falling further during the evening to 0.2 Mbps. At 4 am goes back to 5 to 6 Mbps. At weekends 2 Mbps falling to as low as 0.2 Mbps by 10 p.m.. These characteristics are seen by other users irrespective of ISP. In particular TalkTalk and Supanet say fall in speed is down to BT while BT say it is an issue for ISP.
Can it be users taking up band width available to ISP when major change is as though a switch has been thrown, BT Traffic Shaping or other issue?