So I've verified that WOL does work using an ubuntu live image so hardware and bios settings must be fine.
I then tried to start again with a new DSM install, still get stuck with the same problem.
I've checked with ethtool to make sure WOL is supported and enabled.
I must be doing something silly, maybe I'm not shutting the machine down in the correct way, how do you shutdown your microserver?
Does your power button shutdown gracefully, mine doesn't seem to do anything.
Thanks,
Mike.