Thank you for your question. You mentioned your site is being served from California even though you are in London.
Thought process: Traffic may not route to the nearest node due to ISP issues, network congestion or maintenance.
Response: I checked your configuration and confirmed your site is active on Cloudflare’s network. The reason you're seeing California could be due to how your ISP routes traffic. This situation is rare and typically transient. I recommend testing from other networks or using traceroute/tracert to examine the path. Let me know about the outcome.
Tools used: traceroute (tracert on Windows).