Avoid anti-aliasing for smallest sizes of text because it can make it look fuzzy. Resizing on the page Don't resize graphics on the page - they distort and usually give very odd results when printed out. Other graphics Graphics for text Try to use HTML for text, rather than graphics. The NHS fonts are Frutiger and Garamond families. Avoid using graphics where they are not necessary.
Image maps Try to avoid using image maps.
It is probably better to redesign the image with areas that can be sliced into individual graphics. Use client and server side. Provide ALT tags. Use an HTML text-based alternative below the map. Make sure you have permission to use it online.