You've got (in my view) borderline signal to noise ratio on your highest frequency channels and that's causing breakthrough of uncorrected (post-RS) errors. That's not good, but isn't causing the latency spikes. Your BQM shows the footprint of over-utilisation that's more serious and got entirely different causes in the form of a network that can't handle the traffic that VM have signed up to it.
I think the cause may be lockdown andthe recent rash of console and game releases, that are driving VM data traffic much higher. If you look at your BQM, things are OK from half midnight to early-mid morning, get progressively worse, and then stop abruptly at half midnight. To adapt from a message I wrote earlier, If I'm correct VM probably won't do anything about it because although bad for you, there's far worse over-utilisation problems to deal with than that shown on your BQM. I'd be keeping my fingers crossed that it resolves itself as and when we get out of this lockdown chaos. I'm always happy to put the boot in on VM when I think it's deserved, and recommend options for complaining and changing ISP, in your case I'd strongly suggest accepting that things are difficult at the moment, and hopefully your latency issues will resolve as this year's game release season wanes, and further out the world moves back to some semblance of normal patterns of working.
Given all that's going on, and the approach of Christmas, I wouldn't be at all surprised if (even if this does self-resolve) the problem persists until February. If it is still going on then your only options are to put up with it, or to find a new ISP. And finding a new ISP may mean a huge speed cut to trade bandwidth for latency, as well as (probably) invoking VM's complaints process and possibly escalation to CISAS to be released from any fixed term contract. By all means go down that route if you want, but think it through very carefully before doing so - it's slow and may not be for the easily dissuaded.
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Thanks for your insightful response. Sad times when the only course of action is to live with it. I had the same issues back in May and was told they would upgrade our area to be able to deal with this. I pay for a service and expect it to be usable so shall continue talking to Virgin.