Right then, I had a 35 page Word document* which had many paragraphs each separated by four lines of white space (the equivalent of 'enter' having been pressed four times). One line suffices so I sought to find out how to quickly Find / Replace (Ctrl+H) the three extra linespaces with nothing (or I could have replaced four linespaces with one linespace).
@dianthusmed had the answer to my question
Word: document has 3 or 4 linespaces between paras - quick way of making it one line? Tried / failed Ctrl+H and variants of ^p / ^13
— Jo Brodie (@JoBrodie) May 24, 2012
@JoBrodie If they're line breaks rather than paragraph marks, you need ^l in the replace box, not ^pIt works: ^l^l^l is the string to select three linespaces. The ^ is called a caret.
— Dianthus Medical (@dianthusmed) May 24, 2012
1. Press Ctrl+H to bring up the Find and Replace menu
2. Type ^l (SHIFT 6 on full-size keyboard and the letter L) three times into the 'Find what' dialogue box, leave the 'Replace with' box blank
3. Click the Find Next button to make sure it's selecting correctly and then Replace to replace - once you're satisfied that all is well click the 'Replace All' and smile as your 35-page document trims itself to 23 pages.
Thanks also to @zeno001 who offered suggestions too and this is also a useful read "Special characters you can use with Find and Replace in Word"
*Technically it's a LaTeX document that I'm viewing in Word. Ironically I can't compile the 'tex doc into a pretty thing to read because there are other files (bibliographies) embedded into the doc that it needs to run and I don't have access to them. So this was my workaround, but I like saving paper when printing.