Ordnance survey provide some style files to support their vectormaplocal product. The style files appear to come in pairs, similarly named but one with a .xml extension and the other .xls The two files together seem to be designed to define the style but my problem is how do I get the two into a format that QGIS can handle?
Here, the XSL file is a style sheet language file (XSLT, or eXtensible Stylesheet Language Transformations) for transforming the XML file into other XML documents or other objects such as HTML, plain text, pdf, etc.
A priori nothing to do with QGIS, especially if one looks OS MasterMap® style guidance
Transforming GML using XSLT
These styles are also supplied as an XML Style sheet (XSLT, or eXtensible Stylesheet Language Transformations), which includes the style descriptions from the OS MasterMap user guide in an XML format, for all OS MasterMap layers (excluding Imagery layer).
For those interested in using XSLT with OS MasterMap an example is provided below that applies the OS MasterMap style guidelines to the independent polygon GML data to produce SVG. Both files below are required and should be used in the same directory as the data being converted. ....
and the example files have nothing to do with QGIS
QGIS style files (qml) are also a XML format. Theoretically, it would be possible to create another style sheet language file to transform the Ordnance survey XML into a qml file.
But happily, QGIS, support another XML format, the SLD format (Styled Layer Descriptors, see SLD Support and other QGIS 1.8 Style Features of Underdark) and you can download these styles in SLD format in OS VectorMap Local "NEW Styled Layer Descriptor files" or in Styled Layer Descriptors (SLDs) for vector products