The BBC were right to broadcast the North Korea exposé
We learnt nothing that the world did not know already. I look forward to a Panorama dedicated to a debate on the moral and ethical grounds for such programmes that put others at high risk.
M J C Walters
Beetley, Norfolk
SIR – What exactly would be missed if the LSE’s students were unable to take further trips to North Korea? The programme showed a country that is so sterile to visitors that the costs must far outweigh the advantages of going there.
Richard King-Evans
Hambye, Normandy, France
Children’s advertising
SIR – The call to ban advertising aimed at young children (Letters, April 11) demands a reworking of a very old-fashioned debate.
Children have a much broader set of influences now than in previous generations. The increase in internet usage, product placement in children’s films, increased influence of siblings, peers (virtual and real) and so on makes parental intervention in the forming of their child’s opinions much more challenging.


