OS OpenData
ordnancesurvey.co.uk
Free (verified)
Ordnance Survey's free datasets for Great Britain (mapping, boundaries, terrain, rivers, postcodes) under the Open Government Licence.
- Best for
- Surveyors needing free GB base data.
- Cost
- Free under OGL (stated on page).
- Category
- Mapping and GIS
- Source
- ordnancesurvey.co.uk · checked 15 Oct 2026
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