Andrew, you seem to be thinking we are querying the tbb speedtester. Nearly all your posts seem to be defending it.

For my part, I in no way question the validity of the tests the OP has submitted. I believe the issue, whatever it is, is somewhere between and including his computer network card, Daisy and the peering arrangements the other side of Daisy. If tbb have direct peering with Daisy then I would say it does not lie at the tbb end.

There is also the question of what throughput arrangements the OP's ISP has with Daisy Wholesale. I don't know which ISP it is.

Was just making that very clear, as posts could be interpreted in two ways.

NOTE: If this was a peering issue you would almost certainly NOT see the flat nature of the single thread over the 8 seconds of testing.

Flat lines that are not at maximum speeds point towards something limiting things.

They are indeed throttling due to me being a 'very heavy data user on average about 1TB (1000GB)
per month'

It seems they might be letting you go when they are on lighter loads though. Just clobber you when they have higher demand, perhaps on the basis that you can't need it all the time? The multi-thread seems to be adequate for most purposes even when they are holding you back.

The clobbering can be brutal though, rendering iPlayer unwatchable at times.

It's quite rare that I use iPlayer but I was looking forward to watching a one-off documentary on BBC Alba and was spitting feathers when it was constantly buffering :mad:

Also, being a Windows Insider it can turn what is usually a 10 minute download & update to well over an hour.

Does iPlayer single-stream then? That hadn't occurred to me.

This would seem to indicate it does.