I am looking for companies/sources that can provide GIS layers about soil properties (e.g. soil moisture, soil pH, texture, nutrients) at a relatively high resolution (< 500 m pixel) in the UK for research in the Agritech sector. These sources can be either free or paid.
You probably want to start by looking at the UK Soil Observatory run by the British Geological Survey. There is also the National Soil Map and other datasets in the Cranfeld University Land Information System. Both these sources provide online data but may also be able to help you further if you contact them directly.