Apologies for my ignorance! I have few Raspberry Pi's in a network attached to a server and every time I make changes to the image I have to write image to all the SD cards again, can that be automated to update automatically from a network share.
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One way this could be achieved is by using the u-boot bootloader. U-boot can both check remote servers for updates, and write updates to flash. There are plenty of guides googleable on how to set up uboot for a Raspi, e.g.:
http://arrizza.org/wiki/index.php/RPI_U-boot
Once booting from u-boot, you can write a u-boot script to check a tftp server or similar for an update, and write it to flash if available, before automatically rebooting. Some scripting example and guides can be found at:
http://wiki.lemaker.org/Building_u-boot,_script.bin_and_linux-kernel