Area of interest? (lat lon constraints)
Min licence size? e.g 200ML/yr
Restrictions allowed? Y/N
Min distance to major road?
'Categories' to remove / include? (e.g. brewing v quarrying)
Unwanted aquifers? (e.g. Chalk)
Open NALD Excel database (obtained from regulator)
Remove duplicates. (reduces aggregated licences to a single entry)