It claims London E1W for my IPv4 and IPv6 RIPE PI space, and the same location/postcode for my EE home broadband. Generic 'London data centre' postcode? Or the location of the nearest Cloudflare POP, maybe? (Whois on the PI blocks shows a correct postcode some distance from London FWIW.)
[Edit: same location and postcode for a Vodafone UK v4 address too.]
[Edit: same location and postcode for a Vodafone UK v4 address too.]