Windows 10, WDT & WDS problem

I am trying to deploy Windows 10 Pro using WDT and WDS.

I have followed the following instructions from Microsoft Deploy a Windows 10 image using MDT but get the dreaded 0xc0000001 after the PXE boot (litetouchx64.wim) has loaded.

I have increased the TFTP maximum block size to 4096 and unchecked "Enable variable Windows extension" but to no avail.

Can anyone give me any pointers?

Thanks in advance,

Matt