29 SEPTEMBER 2007, Page 19

Explosive issue

Sir: James Delingpole should have paid more attention to the science lessons at school. In his review of the Hindenburg disaster (Television, 22 September) he refers to the time when 'leaked helium gas ... was ignited by static electricity'.

Helium is not flammable. Hindenburg (and the later R101) were filled with highly flammable hydrogen. Green proponents of hydrogen-cell technology should take note.

David Barron Southampton Sir: James Delingpole is quite wrong in describing our armed forces as 'ruthless killers'. Any fool can kill, as is all too evident from the streets of London and other cities. What they are trained to do is to keep each other alive. That is why they create such strong bonds. If it was not clear to the reviewer, then the director is to be found wanting.

Jeremy M.J Havard London WS