They like cat food (or you can buy hedgehog food at garden centres)
It might start coming regularly if you start feeding it. Some of them run away when you approach, others will just sit still, let you put the dish of food right in front of them and, once you've gone, start chomping on it like there's no tomorrow.
http://www.britishhedgehogs.org.uk/FAQS/faqhome.htm