VL53L1 0mm

Hi all
I have a VL53L1 that when connected to a Pi Zero only returns a 0mm measurement. Pi Zero is running Raspbian GNU/Linux 9 (stretch) and Python 3.5.3.

I am just using the distance.py code from the pimoroni github.

Before deploying it i tested / calibrated everything in my “Sandpit”, a Pi B running the same os but running Python 3.7 (am about to upgrade the Pi Zero to Python 3.7) This set up worked fine.