the downstream power levels at the top end of the tolerance, would make sure all white (coax) connections are finger tight, a possibility might need a tech visit this can be arranged via the forum staff
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.
You should mark your last comment as helpful as that's the solution. I recall after reading that I used to get the same problem It was down to the wiring more than the adapters but I had to swap them out for a loooooooooooooong piece of Cat6
@andrewbakes2019 wrote: iv tried both it seems when the poweline adapter is connected i got from vm halfs the speeds taken that out and get 456 up 35 down now
Powerline adapters will affect speeds as they are half duplex and are affected by the amount of noise on your electrical mains. so i wouldn't expect much more than 15 to 25% of the powerline's adverted speed.
I have seen some decent powerlines provide actual speeds of over 400Mbps, but the powerlines were tested in the same room which kind of defeats the point.
@happywithmy350 wrote: I've had 350mbps speeds over a pair of 1200Mbps plugs - with one upstairs and one down stairs - until I had a car charger put in and then it all went to pot
Lots of houses have separate rings for left and right side of the house rather than the traditional upstairs / downstairs. This can mean your upstairs sockets if above or on same side could perform much better than other sockets downstairs but on the other side of the house.