The latest from Zen is:

We are starting to see a few of these higher speed services not achieving the higher ends of the advertised speeds. We're therefore collating data to analyse and look for common trends which we can then use to progress a wider issue with the supplier.

I've been going through the steps and it's finally been escalated to OR. Hopefully they'll be able to visit tomorrow.

I'm using a Raspi4 for some testing, should be good to about 800Mbps but I get the following:

pi@raspberrypi:~ $ speedtest
Retrieving speedtest.net configuration...
Testing from Zen Internet Ltd (xx.xx.xx.xx)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Iomart (Maidenhead) [63.72 km]: 10.993 ms
Testing download speed................................................................................
Download: 217.20 Mbit/s
Testing upload speed......................................................................................................
Upload: 72.34 Mbit/s
pi@raspberrypi:~ $ speedtest
Retrieving speedtest.net configuration...
Testing from Zen Internet Ltd (xx.xx.xx.xx)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Iomart (Maidenhead) [63.72 km]: 10.426 ms
Testing download speed................................................................................
Download: 457.25 Mbit/s
Testing upload speed......................................................................................................
Upload: 81.65 Mbit/s
pi@raspberrypi:~ $ speedtest
Retrieving speedtest.net configuration...
Testing from Zen Internet Ltd (xx.xx.xx.xx)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Iomart (Maidenhead) [63.72 km]: 10.32 ms
Testing download speed................................................................................
Download: 475.84 Mbit/s
Testing upload speed......................................................................................................
Upload: 81.65 Mbit/s
pi@raspberrypi:~ $ speedtest
Retrieving speedtest.net configuration...
Testing from Zen Internet Ltd (xx.xx.xx.xx)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Iomart (Maidenhead) [63.72 km]: 9.985 ms
Testing download speed................................................................................
Download: 435.95 Mbit/s
Testing upload speed......................................................................................................
Upload: 86.46 Mbit/s

I'll probably switch out the router when I get this resolved.

I suspect that Openreach will not find a fault at your end. Zen are aware that a number of customers on the Full Fibre 500 and 900 products are experiencing poor download speeds. The update I had from them this afternoon is:

We're continuing to try and resolve throughput issues for our customers reporting issues on the FTTP 500 and FTTP 900 products.

We are trialling with a small sample of customers adding an elevated traffic status with BT Wholesale to see if that allows higher speeds to be met & also more consistently higher.

We do need a reasonable amount of time to try and fix this and can take a week or 2 to resolve this issue and will keep you updated accordingly.

In reply to a post by tboorman:

I suspect that Openreach will not find a fault at your end. Zen are aware that a number of customers on the Full Fibre 500 and 900 products are experiencing poor download speeds. The update I had from them this afternoon is:

We're continuing to try and resolve throughput issues for our customers reporting issues on the FTTP 500 and FTTP 900 products.

We are trialling with a small sample of customers adding an elevated traffic status with BT Wholesale to see if that allows higher speeds to be met & also more consistently higher.

We do need a reasonable amount of time to try and fix this and can take a week or 2 to resolve this issue and will keep you updated accordingly.

Any idea if the actions put in place resulted in a resolution?

Any idea if the actions put in place resulted in a resolution?

Turning on the elevated traffic status feature resolved it for me.

In reply to a post by tboorman:

Any idea if the actions put in place resulted in a resolution?

Turning on the elevated traffic status feature resolved it for me.

Many thanks. I wonder if they're doing this as a matter of course for new provisions now, or only enabling it if you complain...

As far as I know, the issue was only affecting certain customers. Whether they ever got to the bottom of it, I do not know.