Python Scripts integration ... running as a service from Dev Tools

Just started down the path to use the Hass Entities python script … prerequisite is to add python scripts - done.

However the I cannot get the hello world example to work from the Dev Tools - Services section

service: python_script.hello_world
target: {}
data: {name:jona}

I get the Green tick when I Call Service, but nothing is showing in the log book …?
I am confident the Logbook is working and set for Info as I’ve used it before

So another dumb noob question, what have I done wrong?
TIA