Dave I appreciate your explanation, but I think you shouldnt be fiddling with tcp buffering.

TCP is self regulating, it expects to work in a certian way and doesnt expect to be messed with artifically, eg. it may interpret your actions as congestion wrongly. Whilst a tcp connection may very briefly spike at the start as it finds its feet, its hardly a problem, its by design and will self regulate itself.

But this has caused you problems?

I dont know, I have had some issues with certian end points not ramping up speeds as expected, but there could be one of many reasons why that occurs, the isp messing with buffering obviously doesnt help when diagnosing such issues.

I just noticed that my fttc speed had the fastest I ever seen all this week. Used to be 72/17 but now it around 74/19. Have Plusnet / BT added capacity platform to improved the speed this week. Also there is no congestion all this week.

Hat off to plusnet. Quite happy overall.

will pm you tommorow so you can bump both my test and main account.