[quote user="danny-cooley"]I'm assuming that should be we able to obtain this from the relevant source, we could insert/attach this to the 'Select Geographic Coodinate System' tool. Would that be a reasonable/viable thing to do?[/quote]
If you get the "London Survey Grid" GCS-Parameter you would be able to create thsi GCS with "Bentley Map" and may use it then with Microstation. There are some posts showing to way to archieve this in: http://communities.bentley.com/products/geospatial/default.aspx