It is indeed Openreach FTTP, but that's usually not significant - for years I've kept an eye on my elderly mother's Zen connection, and it has had similarly low and clean latency via a rural FTTC connection at 35 Mbps and a copper phone line. Not that at 84 she's a hard core online gamer.
When I was with VM, it was rather galling that whilst I had speed six times hers (and double the price), my latency was always far worse. Now I can play without the VM latency penalty, but of course it also means my mediocrity as a gamer is only attributable to me.