Not accurate. You've taken a valid data point and over-extrapolated from it. Openreach provides the physical cable for the majority of customers (excluding cabl

Not accurate. You've taken a valid data point and over-extrapolated from it. Openreach provides the physical cable for the majority of customers (excluding cable and FTTP, the latter of which is steadily expanding). However the physical cable connecting the customer to the IX is only a part of the picture of providing internet access - and you over-fixate on this. From there, you're routed through to infrastructure owned and operated by the individual ISP you've chosen - and these infrastructures are not identical. Some do more filtering and inspection than others. Some are pure ipv4, and some support ipv4/ipv6 dual stacks. Different routing designs within these networks mean that latency and jitter can be very different (one major ISP is particularly notable for poor internal latency due to a legacy network design). There's a lot of complexity here that you're ignoring.