Demo of a model fitting to multiple data sources #239

As far as I am aware all the technical functionality is now in place to allow for fitting to multiple data streams and to support partial pooling etc.

It would be great to create a demo that specifies this kind of model, simulates from it, and then fits to it. This could be used as an integration test/development aid for the core team and also allow stakeholders/those outside the core team to comment usefully on the current design vs requirements for specific use cases.

From f2f chat with @damonbayer (light on details as its late my time!)