Licensing options for this format begin with FME Desktop Professional Edition.
The Ordnance Survey (Great Britain) National Transfer Format (OS(GB) NTF) Reader module provides FME with access to data in the United Kingdom (UK). This format is documented in the British Standard BS 7567.
More information on data products available in the OS(GB) NTF format, and their detailed product specifications, are found at this website:
FME considers a single .NTF file, or a folder containing a set of .NTF files, to be a dataset. Groups of closely related records within the files are grouped together and transformed into FME features.
In addition to geographic features such as points, lines, polygons, and text features, this reader also produces features representing the relationship between short feature code values and longer feature class names.