In reply to a post by Pheasant:

Good news you have green lights again on the ONT

The Eero box will connect to the ONT at 1Gbps link rate on Ethernet. This is correct and as expected.

If the eero is only reporting ~515 Mbps throughout on download, then that suggests you have been put on the wrong profile by TT.

Check again in the morning, as they may have applied a change overnight. Otherwise it’s time to get back onto support…

[also invest £10 in a USB-C/Thunderbolt GigE Ethernet adapter. Very useful to have and you will actually see the speeds at the top end of your 900 Mbps service (once working!) that you wouldn’t otherwise on WiFi]

Thanks for the recco - Will order this PM, as probably good to hook up the likes of the Amazon Fire TV & various laptops.

TalkTalk don't quite understand the issue and are claiming they need to escalate it which i'll find out the response with in 48hrs supposedly. Fingers crossed. City Fibre install at the grandparents tomorrow so hopefully that doesn't turn into a saga as well!

In reply to a post by Whitehall11:

show 515 down and 110 up.

You should get higher then that on Talktalk's 550Mb package.

I got around 525Mb/s throughput on the Talktalk 550/75 package so it's unlikely to be an incorrect profile or if it is it doesn't match what they say for the downstream on that package.