Thanks for the fast responses.
George, your tips helped. Simply a case of the documentation is not up-to-date (https://wiki.fogproject.org/wiki/index.php?title=ProxyDHCP_with_dnsmasq)
It came down to a number of tweaks and looking at the ltsp.conf file you provided.
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Confirmed the dnsmasq version running on the FOG server was later than the one you recommended
dnsmasq -v | head -1
Dnsmasq version 2.76 Copyright
2000-2016 Simon Kelley -
Removed the sym links
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The pxe-service entries didn’t have the full filenames in the last field (e.g. undionly instead of undionly.kpxe)
pxe-service=X86PC, “Boot to FOG”, undionly.kpxe
pxe-service=X86-64_EFI, “Boot to FOG UEFI”, ipxe.efi
pxe-service=BC_EFI, “Boot to FOG UEFI PXE-BC”, ipxe.efi
When I PXE boot the client, I am now presented with the FOG Project boot screen.
Much appreciated