Stats might be a good idea if you can have a good and easy to read summary.

What I had thought about was an easy way to target a specific country (maybe that it's possible using a specific parameter, and maybe we should only link to the tool with this parameter set, from our national websites ...)

And maybe a search box if not too complicated / too heavy. Allowing user to search for a specific town.

I write these ideas as I think about them, not sure they're all good ! 

Thanks for the map.