Oh funny. Okay, it seems the teradata employee windows VPN somehow conflicted with the NAT networking. (a problem that the externals might have if they are porting into their respective workplaces).
Once this was turned off, I could ping, the guest from the host - happy days!
Addendum for good measure I did a /etc/init.d/tpa stop, /etc/init.d/tpa start for good measure, because the PDE fell over again (or did I do tpareset -f restarting? can't remember) either way I had to because I checked pdestatus -a and I discovered it had landed on it's face again.
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