We have Virgin Media M500 and no matter what time of day the download speed using Ookla speedtest is less than 40Mbps which is amazingly slow when you're paying for 500Mbps. This is on a wired connection at all times of the day.
Thanks for your post and a warm welcome welcome goes out to you! It's great to have you on board.
I am really sorry that you're not receiving your expected speeds. I have checked your services from here and can see multiple performance issues which will require an engineer visit to resolve. I have booked you in with the earliest available slot we have, which you can find the time of here: virg.in/myVM
Please let me know if you need anything else from us and how things go after your visit.