Yep, either I'm unlucky or too fussy. But the power supply issue was really dodgy. Tried it again last night hoping I'd made a mistake, but still there.
The Shuttle 9 I had did not have a straight chassis. I checked it on every surface in my house and it would not sit straight, so it rocked about all the time. If still like another.
Weirdly, the two amps I sold were flawless (lm3 and rh450) so I was annoyed to spend more and have two amps with issues.
Fender UK have confirmed my resplacement is on it's way from the US now. Good chaps.
So, a box with my 750 and sl900 are on their way back to Bass Merchant for replacements....as well as my 6 month old immaculate 2EQ ray that has a very loud buzz coming from it, (again tried all variables, different power, new battery, compared it to the other basses, 2eq still noisy).
All in all a massive annoyance Hopefully in two months I'll have everything sorted out.