1) You can message us through Kickstarter to ask about making multiple pledges. If you've already pledged, you can up your pledge amount by the relevant amount and **as long as we have a message from you**, we'll account for your extra reward in the total and make sure you get it. If you haven't already pledged, just add the totals together and pledge for that amount; again, as long as you **send us a message**, we'll count both your rewards in the total and make sure you get them.
Either way, make sure you send us a message - otherwise, if you just pledge an extra £30/£15, we'll just think you're being generous and may not account for your book in the limited print run.
2) You can set up a second Kickstarter account and make a second pledge. Simpler for us but more complicated for you :)