Hi SimonDC,
A warm welcome and thanks for posting on our community forums. Sorry to hear that you're currently experiencing issues with our internet services. Can we ask if you've been able to perform a speed test via a wired connection at all since your last post?
You can check the link here https://www.virginmedia.com/help/broadband/slow-internet for further help and advice on improving your slow speed issues.
Remotely checking from our end, we cannot see any issues that would be causing your slow Wi-Fi speeds.
Can you let us know if you have had any improvement since your last post?
Kind regards Jodi.