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Trying to find TFWKID for transforming to OSGB 27700

Question asked by nomisc on Feb 14, 2018
Latest reply on Jul 24, 2018 by KrzysztofLadny

I want to use the OSGB as my co-ordinate system for display in my app, rather than Lat Long WGS84. I've added OSGB using WKID 27700, but can't work out which TFWKID to use. I did a search on the Datum Transformations page (Datum transformations—ArcGIS REST API: Services Directory | ArcGIS for Developers) but the two that refer to Ordnance or Newlyn both yield an error message. I've also tried Googling without success. I'm sure it's simple if you know it, but I don't.