Does it make any difference using the RJ11 cable that came with the HH or using a higher quality cable?

Did that change coincide with the change in speeds?

It is not just your VDSL & phone wiring - is there a new TV, DAB radio, central heating pump, fridge anywhere near?

LED Bulbs?

It's the same RJ11 cable that I've used all along, could try a different one I guess to rule it out?

The only electrical change is where my tv stand along with everything on it ie tv,2 games consoles, skybox and sound bar is now situated which is very close to the HH5 and master socket.
It gets moved every december to make room for the christmas tree, never noticed the drop before but more than likely not looked for it either.

Is the Sky box on a filter?

It's not connected mate.

1. Best Effort Test: -provides background information.

Download Speed
68.23 Mbps

0 Mbps 70.46 Mbps
Max Achievable Speed

Download speedachieved during the test was - 68.23 Mbps
For your connection, the acceptable range of speedsis 40 Mbps-70.46 Mbps .
Additional Information:
IP Profile for your line is - 70.46 Mbps

2. Upstream Test: -provides background information.

Upload Speed
11.21 Mbps

0 Mbps 20 Mbps
Max Achievable Speed

Upload speed achieved during the test was - 11.21Mbps
Additional Information:
Upstream Rate IP profile on your line is - 20 Mbps


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Downstream IP profile has dropped after this mornings reboot too

If it is powered up, it would be interesting to turn it off and remove its power plug from the mains. The power plugs can put out a lot of electro-noise.

The living room has now been put back as it was before christmas, so I'll have to wait and see if things go back to normal eventually!

Spoke to an outsource bt agent online last night what an absolute and utter waste of time that was!!