@pelson you may need to confirm this, but I also see there is also a reference to `ukum_stash_source` in the mo-netcdf conventions (http://www-nwp.metoffice.com/~usbw/mo-netcdf/latest/conventions/ch10-model-simulations.html#um-stash-source). Personally, I think that it may be a typo but @rockdoc should be able to clarify.