The font used for the H in the roundel is Bladi One Slab 4F Heavy. This is a commercial font available from myfonts for £25. The font used for the Nottingham Hackspace text next to the roundel is Oxygen, a free font available from Google Fonts.
The following fonts can be combined with the text and images on this website to make shared promotional materials. These fonts have permissive copyright licenses (like Oxygen) that are compatible with this wiki's license (Creative Commons Attribution-ShareAlike):