After playing with the I2C bus on the Pi Zero I found that I was unable to change the baudrate with either of the commands
modprobe i2c_bcm2708 baudrate=200000
gpio load i2c 2000
Apparently you now need to set the I2C speed in /boot/config.txt
Mine now reads:
Of course it does need a reboot to change.
won’t work, but that may be due to my receiver and not the PI