Could be an agastache or monarda...of some description. If the leaves smell of liquorice, it'll be agastache.

try Agastache anista. aniseedy scent, loved by the bees etc

Hi Andy/Seaburngirl. For some reason the comment I posted to Andy last night has not appeared. I think he's right about the Monarda suggestion as I went into my photos and renamed them "Monarda citriodora subsp. austromontana". But after reading up about the agastache I think I would like as I love liquorice and aniseed!

This looks pretty, where in your garden did you plant it? It seems like a plant that might look out of place just any where. Did you plant it amongst other plants?