Source document inaccessible: S&P Global PMI portal (https://www.pmi.spglobal.com/public) is protected by CloudFront bot mitigation. All automated access attempts (curl, browser-use) return 403 or 404. Primary source requires paid subscription; no public document URL available. Event ID: 399731, Indicator: Manufacturing PMI (GB), Period: April 2026, Release Date: 2026-05-01, Payload values: actual=53.7, previous=51, forecast=53.6.