OK.....I give in.
Having the box working great with my old Primesat Universal LNB, I decided to buy the Unicable II 24 channel.
Guess what....dumb dumb here is completely lost. In the absence of ANY setup instructions, I found a post that setup the unicable with a VU+. It gave me a bit of a headstart (sort of...), and helped me with the "tuner config" in the Gigablue.
Nothing.....no signal on 28.2. Unless its a bad LNB (which I doubt), its my bad attempt at setup.

So....perhaps its a VU+ I should have gone for in the first place.....there's more info online for one of those boxes.

Anyone give any advice before the GB goes on Ebay??