Thanks for the update, Looking at things from our side I can see there seems to be a short-term stability issue we're aware of, this may cause intermittent or performance related issues with the customers connection.
In the vast majority of cases, these types of issues are resolved after 24 hours. If you can please keep us posted with how you get on.
Update: Intermittent drop-outs lasting between 15secs and 5 minutes any time of day
Now: SamKnows check. Hello, this message is back again.:
This WiFi network does not support RealSpeed
Make sure you’re on the same WiFi network as your Virgin Media Hub. The Virgin Media Hub must be on router mode. You’ll also need to temporarily disable VPNs if you have one.
This has now been sorted by me. It was the Avast anti-virus blocking the signal. Disabled it for 10 minutes and SamKnows worked fine. Then totally uninstalled Avast and used something else. The speed on my computer shot up to nearly 1000 which compared to other speed tests!!