The Journal of Archaeological Science has a recent paper on the geophysical detection of charcaol burning sites, if that would be of any interest to you.
From: Paul Boothroyd <[log in to unmask]>
To: [log in to unmask]
Sent: Monday, 16 April 2012, 17:34
Subject: [BRITARCH] Charcoal stances
Does anyone know of any up-to-date work, surveys and excavation reports on charcoal stances/platforms in woodland?