Very interesting - his own CV, and no mention of 'Sir'.
http://www.llrc.org/misc/subtopic/cvbusby.pdf
1.5 EXPERT WITNESS. Since 1997 Chris Busby has been engaged as an expert witness in several cases that relate to the effects of radioactive pollution on health, .....
Several cases! Since 1998 he appears in 50, repeat 50, court cases, 20 of these currently ongoing. Carpets and bags come to mind.