Sir: I was really interested to see your ‘Switch the Lights’ Campaign in last week’s issue (15 November, p30).

We fully support your campaign and are progressively installing LED lighting across our estate. This has included switching to LEDs when we refurbish branches, as well as using LED lights as standard in our new builds. In all, we have 78 branches with LED lighting.

To date, we have installed 70,000 LED light fittings saving an estimated 1.8 GWhrs of electricity.

In addition, we have built light tubes in some of our newer shops, which draw in natural lighting and reduce the need for artificial lighting.

Congratulations on highlighting such a key environmental issue and best of luck with the Switch the Lights campaign.

Nigel Keen, director of development, Waitrose