rosemary beetle

I found a tiny beetle on the rosemary - sadly it was in dark undergrowth, but sat still as I set up. No idea how pretty it was until I looked on-screen.. I think I snapped the parent a week or so ago - fascinating.. no idea what it is yet.. any ideas?
As I put into the comments - quickly found :- Chrysolina americana
- I didn't realise when I put the title - common name - rosemary beetle!