If you are looking for the "National Trust look" (a clean, humanist sans-serif with a British heritage feel), you can find professional alternatives on established marketplaces like MyFonts or Klim Type Foundry :
For decades, the National Trust used bespoke signwriting and serif typefaces that varied by region. This lack of uniformity, while charming, posed challenges for centralized branding. national trust font download
No. Websites that claim to generate text in the National Trust font are usually using a generic serif like Times New Roman or a pirated copy. They are not safe. Use the alternatives above. If you are looking for the "National Trust