Thanks for your advice on what we should be doing in London's NHS to influence the mayor and Greater London Assembly ('Don't get mugged in London', comment, page 21, 13 April).

We have been busy working on just this process of cross-agency debate for the past two years.

Over 1,000 people from more than 300 organisations have contributed to the development of the London health strategy. Our Coalition for Health and Regeneration is involving these organisations working together to move the strategy forward.

This coalition will be a powerful force for health improvements in London. We all recognise that health runs through every strand of public policy, and by working together the coalition can promote health and move toward helping the mayor and the GLA to deliver their agenda for the capital.

Dr Sue Atkinson Director of public health London regional office