I'm looking for a free bit of software to make doing layouts of leaflets & booklets easy...
Anyone got any good suggestions?
So am I. In the meantime I use InDesign. You can download a trial (https://creative.adobe.com/products/indesign?promoid=KHTUY).
If that's not feasible, you can get PagePlus (http://www.serif.com/desktop-publishing-software/) for free.