game lag during peak hours since last patch - eu datacenter.

[Norna]

If it helps any sort of investigation my ISP is Virgin Media, I've heard that people have had some problems before with them, though thankfully mine have been relatively minimal with only a few lags spikes at worse and only having had one or two major lag spikes recently per night.

I don't think it's Virgin Media (or any of our ISPs) this time, considering that I'm Telia all the way from first to last named nodes.

That the troublesome node in question has nearly the same address (only the suffix being different) as FFXIV's servers suggests that it belongs to whomever owns the FFXIV EU data center, or at least their ISP, instead of ours.