Building Digital UK (BDUK) does not monitor nor track the latency of superfast broadband lines delivered through their rollout programmes. BDUK and Ofcom only collect speed data, not latency data.
BDUK receives delivery and speed data at a premise level in the form of a delivery report that is received from suppliers every quarter of a contract up until delivery completion. This provides BDUK with information on what premises have been delivered to, what upload and download speeds they expect to receive, when the premise was built to, and what technology was used to build to that premise.
Local Authority and constituency level data on available speed is published in Ofcom’s Connected Nations reports and summarised on the House of Commons Library website.