Now, I decided to try a "light" installation of Cloud Foundry as this isnt going to be production ... normally it seems you deploy BOSH then you deploy Cloud Foundry from that, but light uses bosh micro.
Create a folder to hold your installations, then run
brew tap xoebus/homebrew-cloudfoundry
brew install spiff
Things will then kick off -- downloading th ebasic stemcell and pushing things onto the bosh micro director to perform.