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viewing a OS basemap gallery using javascript api 3.20

Question asked by Loenco826 on May 25, 2017
Latest reply on May 29, 2017 by Loenco826

How do I use the javascript api 3.20 to add a basemap gallery to my js app so that I can see the Ordnance Survey Open Data basemaps?  At the moment I can see and select the non-OS ones and then when I select an OS basemap it tells me that the 27700 Geometry cannot be converted to the SR of the map (102100) which is the default of the gallery.

I don't mind if the gallery only contains the OS basemaps. Thanks