I have found a version of the Segger tools that appears to simply offer flashing, and erasing.
It’s an executable that should be moved to the desktop, I guess. When installed the icon looks like this.
Set the Device to nRF51822_xxAA
Set the Interface to SWD
To erase the chip press (you guessed it) Erase Chip
To program with a hex file, browse to find the hex file.
and press Program Device