Please HELP! Fibre BB speeds, Negear R6250, SSE BB

I apologise in advance for the long post, I'm just desperate to try and fix the issue, I feel as though this issue is taking over. The internet is so important to us for work/college etc

I have SSE Fibre BB, that came with a Technicolour router), but the speeds were 75+MB then <1MB causing streamed TV/Playstation etc to freeze/buffer/stop.

What's been tried so far...

Replaced wires
SSE sent a replacement but upgraded router - Same issue.
BT changed the modem
BT have changed the card at the exchange (I've no idea what this means, but they've changed it)
I bought a TP Link TP-LINK TD-W9980 - Same issues.
Now I have a Negear R6250.

When I do a speed test on the laptop it shows 60+MB most of the time, but I can't stream Amazon Prime on the TV as it says Insufficient Bandwidth. I can try to stream a YouTube video on my phone, but it will start and stop repeatedly, whilst the speed test says 60+MB

The equipment we use (in case it helps)
BT Openreach Modem with Netgear R6250 Router

LG 55in 4K TV -
Asus Zenbook x2 -
Sony Z3
DroidBox T8 Model
Humax Freesat Box model 1000s - This one is wired (ethernet)

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Given all the replaced bits time to call the ISP.

They need to fix your internet. BT may be throttling just video streams but a google can find out that.

I don't see anything wrong except one thing. An ISP that is known to do *rappy throttling like that.

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Useless ISP

ISP - SSE Broadband - haven't got a clue. They say they don't throttle at all, but there T&Cs say they do... They're sending BT engineer out again tomorrow.

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I gave the google a read and

Didn't find they were not throttling. Now there was that person that was using a VPN to get content from another region. They could not be helped.

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Seems they gave it up Bob.
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Once they eat the forbidden fruit they can't go back.

For example let's say they don't throttle but don't deploy a CDN for Netflix. Ugg.
Or their DNS (server) is tinkered with to not have some entries.

That's not throttling is it?

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