Can I get a guarantee that M&S will try harder in its sale of sustainable foods, specifically to stop selling yellowfin tuna, which is under threat, and radically reduce, if not completely stop, the use of palm oil?

We haven't and won't sell blue fin tuna. 95% of the tuna that we sell is skipjack where we have pioneered the sourcing of pole and line and have only used this method since 2009. Our yellow fin comes from responsibly managed fisheries which are deemed sustainable. We only use hand line and long fishing systems. We don't use the indiscriminate systems such as purse seine and fish aggregating devices we helped found the global tuna alliance to further encourage responsible sourcing.

In 2017/18 all the palm oil used in M&S products were ‘Roundtable on Sustainable Palm Oil’(RSPO) certified. This is up from 90% the previous year. The 3% remaining is covered by the purchase of RSPO credits (previously known as Green Palm certificates). Additionally, we sit on the Board of the RSPO and we are helping to drive standards and encourage the transition to sustainable suppliers.