I did have some figures somewhere, but they were from about 2014. The split was pretty even at that time.
But that's useless info now because the past few years Openreach have been mostly installing Huaweis.
I was told from a reliable source that the original trials included both Hauwei and ECI. However when it comes to national rollout, it does make sense that the '3dB' profiles would work best with those cabinets successfully using G.INP.