Charcoal is widely used as a domestic fuel for cooking in many towns and cities in developing countries as it is cleaner and easier to use than wood.
Unfortunately, Practical Action doesn’t do any courses in the UK, having a focus on international development.
Two organisations that might be able to help are….
LILI – (Low Impact Living Initiative)
Tel / Fax: (01296) 714184
Low-Impact Living Initiative (LILI) is dedicated to helping protect the global environment by promoting sustainable alternatives to various aspects of everyday life. LILI gets people involved in the production of green energy and runs workshops on bio-diesel and thermal solar panels.
CAT (Centre for Alternative Technology)
Tel: +44 (0) 1654 702400
Fax: +44 (0) 1654 702782
I hope this helps.
Good luck with your endeavours.