This article, published in In Practice, provides useful information on the use of footprint tunnels to detect hedgehog presence.
This is part of our Good Practice Guidance for Hedgehogs, produced by Nigel Reeve.
Reference: Yarnell et al. (2015) Hedgehogs in Tunnels: Footprint Tracking Tunnels as a Method for Detecting Hedgehog Populations,pp. 38-41 In Monitoring and Measuring Mitigation Success, In Practice 88 (June 2015) CIEEM, Winchester.