[quote name='Bassjon' timestamp='1425807993' post='2710805']
So guys, can anyone tell me - is fret buzz and rattle acceptable unplugged? (its driving me mad!)
[/quote]
No, fret buzz is not acceptable. I would take it back and explain the problem. You have paid money ( I expect) and you are not happy with it.
Raising the saddles will just make it more difficult to play. You said the neck is dead straight and fret buzz is at frets 1-8. You need to loosen the neck a little. If you look at the trus rod end the rule is generally lefty loosy, righty tighty. If you turn the trus rod probably only a quarter turn to the left then that will probably do it.
I would take it back and explain, though, as KiOgon said.