Thanks Nathan, I realise now it does have a name, however it was only tagged as amenity=gambling so didn't have a name.

I'm not quite sure what to tag it as so would appreciate a second opinion. relevant links:
https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dcasino

https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dadult_gaming_centre

https://github.com/gravitystorm/openstreetmap-carto/issues/3630