Drastic drop in speed - BT Infinity 2

For 10 day now, I have experienced a drastic drop in speed on all devices - two Macbook Pro laptops and two android phones.
I have run speed tests and availability tests whilst connected to the Home Hub 3 by ethernet, but have not rebooted any equipment as other threads on these boards indicate that this is likely to make things worse. Page load/refresh takes ages or hangs and streaming video, even short low-res youtubes either won't load or are choppy.  
Speed tests have varied between 18Mbps and 38 Mbps download speed and 2.5 to 8.5 Mbps Upload speed.
Test results as follows - can anyone shed any light on this?  I emailed BT 36 hours ago and have recieved no response and past experience tells me I will get a scripted call from someone with no technical knowledge anyway
Any help is gratefully appreciated

Good morning Dax1 and welcome to the forum.......
Can you carry out the "quiet line" test ? Using a corded phone plugged into the test socket on the master socket, dial 17070 and choose option 2. There should be no crackles, popping, buzzing, etc, in fact, it should be quiet........
Can you post the stats from your homehub ?
If you found this post helpful, then please click the star on the left, after all, I'm only trying to help........

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    <script type="text/javascript">// paintProgressAndMessageOnBar(100,"The test has successfully completed"); // </script> Test1 comprises of Best Effort Test: -provides background information.
    Download  Speed
    428 Kbps
    0 Kbps
    500 Kbps
    Max Achievable Speed
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    you still have a 3.7mb connection but your problem is your profile is low at 500 instead of the correct figure of 3000.  this is causing a slow download speed.
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    If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
    If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

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