Cloudflare's 1.1.1.1 Resolver service became unavailable to the internet starting at 21:52 UTC and ending at 22:54 UTC. The majority of 1.1.1.1 users globally were affected. For many users, not being able to resolve names using the 1.1.1.1 Resolver meant that basically all Internet services were unavailable.
According to Down Detector, the problems started at around 07:21 BST, affecting customers across the UK. Of those who reported issues, 48 per cent were with landline internet, 33 per cent with email and 20 per cent experiencing a 'total blackout'.