As Max Gasman kindly points out, in my message dated 27th Aug re. wood chunks, I of course meant mm, not cms. It would seem that even after what must now be the best part of 30 years, old fools like me still haven't got their heads 100% round metric. Adam Carr Renergy Ltd Tel: ++44 (0)1598 740043 Mo: ++44 (0)07941 682468