Hi Mr C
I've found the quickest way to increase the spacing is to select the text you want to adjust then select your shape tool. Small boxes will appear by each letter. Select the text you want to move (line/lines) and use your up/down key to move the text. Movement will be in incriments of your nudge setting. I have mine set at .01 which makes it easy to tap the arrow key and stop when the spacing is where I want it.
This method can also be used to kern between letters.

Ron
Recognition Unlimited