Brilliant, thanks. It doesn’t change my preferences from px to mm, though, unless I type in (for example) "3 mm" in the "x" box. But that’s just what I was looking for, and very clearly written, many thanks.
Dave
Anthony wrote:
If you want to move a layer by an exact distance:
1. Click on the layer.
2. Go to edit > transform > scale
3. Your layer will be selected with a rectangular box. On the tool options bar at the top, you’ll see some options if you want to rotate your layer, or change the size of your layer, etc. To move your layer you’ll be using the X and Y options. This option enables you to move your layer relative to your starting point.
4. Click on the triangle icon which is after the X option but before the Y option. If you point your mouse over the icon, it says, "Use relative positioning for reference point". This will set your preferences to mm instead of pixels.
5. Now if you want to move your layer say 3mm to the right, type 3 in the X options menu, however if you want to move it say 3mm to the left, type -3 in the X options menu. Do the same with the Y options menu if you want to move your layer up and down.