Thank you for your replies and welcomes, TheKindleWorm, Kranu and Nomiqayum. I guess I'm stuck with no Wi-Fi unless I want to pay extra for 3G or deal with a lot of high-tech router stuff which I'm really not clever enough to do

I'm currently transferring downloaded files through the USB cable, and will have to make do with that until I'm next at my parents house!
It's probably better for my budget that I can't purchase books from the Kindle store