When you land on gbr.postcodequery.com, you're looking at a site that has been running postcode lookups for the UK for over a decade. That kind of track record is a strong signal that it's a legitimate service, not a fly-by-night operation. The site is hosted on Cloudflare, loads quickly, and has clean records with Google Safe Browsing and DNS blacklists — all things you'd expect from a real, maintained website.
For a data lookup tool that doesn't ask for payments or logins, the presence of a privacy policy, terms of service, and a legal entity disclosure page is more than adequate. The operator has made an effort to show who they are, even though the domain's WHOIS is kept private. The one real shortcoming is the lack of easy-to-find contact information on the homepage. If you need to reach them, you might have to dig into the about or legal pages.
So, is gbr.postcodequery.com a scam? No evidence points that way. Is it safe to use for looking up UK postcodes? Yes, it appears to be a legitimate, established tool. The missing contact info is worth noting, but for this type of site, it doesn't raise serious concerns. Most legitimate postcode databases operate with similar levels of transparency. If you're just running a quick check, there's no reason to be worried.