I recently volunteered to help support the rammed earth-course with Low Carbon Trust at the Earthship in Brighton. The course was facilitated by Rowland Keable from Earth Building UK and Ireland.
The course was in two parts, theory classroom style with discussion and hands-on; making walls and arches by ramming earth which in this case was actually locally-sourced chalk. The course was fun and informative and everyone left with at least the fundamentals in theory and practise and a hefty dose of inspiration.