Thanks all for the info, if i try to push the head round whilst the printer is off it is really stiff. I am just printing some Owen's
Adjustable Axis Alignment Tools, so will have a go at sorting out after. Hard to say what tension the belts are but definitely not slack.
As far as layer thickness, i often use .25 for quick prints and usually find it pretty good, though it depends a lot of what make of filament. Just had sample of colorfabb to compare with faberdashery (great product but seriously, not on a reel!!)