Whilst I do not know whether the following is the reason why some Virgin Media customers are experiencing high latency, I have contacted Virgin Media's technical team this afternoon and this is what they had to say:
"Due to the upgrade work being carried out in your area, you are experiencing high latency whilst playing games online. It could also cause slow download/upload speeds, buffering on video services and slow browsing. Once the work is completed any issues above, will be resolved."
When asked when the upgrade is due to be concluded the response was the following: "July 2017"
The Virgin Media team also asked me for my mobile number so that they could update me via text messages on the progress of the upgrade.
Whilst there is a variety of reasons why some of the Virgin Media customers are experiencing high latency issues at the moment, the reason above may apply to some of you too.
Thanks for posting and a big welcome to the community
Sorry to hear about the problems with your connection. I've taken a look this evening and nothing is standing out in error right now. Are you using a wireless or a hard-wired connection? What results are you getting when you test your speed from an Ethernet connection?
Please get back to us so we can continue to investigate.
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I am having the exact same issue across all my games and its really frustrating. When I phone there is nothing on their end. I have messaged riot support and tried their methods but nothing is working. I also have the 200mb package but im using an ethernet cable.
If you can try speed tests through a wired connection as my colleague Heather mentioned, that would be very helpful.
It may be worth creating a Broadband Quality Monitor to check the performance of the connection. If you do set up the BQM make sure that you go into your router settings > Advanced Settings > Ping > and tick Respond to ICMP echo requests sent to WAN IP.