Recently came back to BT broadband,my download speed was as fast as expected around 30mb down 5mb up.Well aware of these speeds as distance from cabinet is around 1km.I do use a tp-link router,it never misses a beat had it when with BT before.But the last few days my download speeds have dropped to around 15 to 17mb.I not sure if there is a problem with the line or they are throttling my speed back.Hope someone from BT sees this.
Can you post connection stats from your tplink
check for line noise dial 17070 option 2 should be silent and best with corded phone
are you using wireless or ethernet when downloading?
enter phone number and post results remember delete number https://www.dslchecker.bt.com/adsl/adslchecker.welcome
BT are not throttling your connection so there is a problem somewhere