VERIFIED SOLUTION i

How to use the British Coordinate System 1mm accuracy projection in Spectrum Spatial Analyst

It is possible to create base maps in Spectrum using a TAB file in any projection. In MapInfo you can choose British Grid with 1mm accuracy

Step 1 - Create tab files in the 1mm accuracy British projection and save them in MiPro.

Step 2 - Upload to Spectrum.

Step 3 - Use in SSA.

In step 2 you can create a tile map for the data and bring it into SSA as base map (please refer to the help file on how to create a tile map).
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UPDATED:  October 30, 2017