Hi Lee,
For some reason I couldn't get the CURL 'search' to retrieve me the document via the console:
However, saving the expression as a dashboard panel worked fine, and they then appear under the 'Visualizations' section of the Management/Saved Objects tab. This works, as it means all my searches, visualizations (including Timelion) and dashboards can be imported/exported in one go, and I can get back to the original tlion query by looking at the saved panel expression.
I guess if I had one final comment, it might be a good enhancement in the future if the "Save entire Timelion sheet" option in Timelion made the sheet available within the Saved Objects/Visualizations area too as at the moment it's a little confusing that you save it, but it would not be present on an export so would be lost if you then re-imported the objects into a new Kibana instance (as I did).
Thanks again for the rapid (and v. useful) advice,
Steve