I've just been sent this link and hope no one minds if I share it here. Ten walks through Wiltshire, many of them taking in some of the archaeology, both hidden and apparent. Each walk has its own leaflet with description and section of OS map to follow. Pack of all ten walks costs only £2.50 - all walks accessible by bus (information on the leaflets).

http://www.northwessexdowns.org.uk/wba/nwd-aonb/NWDWebsiteV2.nsf/$LUSectionsHome/8?OpenDocument