It was with some concern that I read your excellent article relating to the tunnel which is being built by the National Grid underneath Hendon (Will new power tunnel be safe?', Times Group, February 21).

This excavation will hold cables with a combined voltage of nearly 800 kilowatts (which is more than the voltage on one electricity pylon).

Your article states that "there is hardly any regulation relating to this".

When I contacted Barnet Council about this a few months ago, nobody seemed to know anything about it.

Later, I was told some "files had gone missing".

Harrow Council saw fit to refuse the planning application relating to this for a variety of reasons including health and safety'.

And yet, Barnet Council has shown little interest and has raised no objections.

You say that Barnet Council said 'it had no role in monitoring the EMF' which instead was the responsibility of the National Grid.

If one doesn't trust MPs to monitor themselves, why should we trust the National Grid?

Dr Richard Evans

Selvage Lane, Mill Hill