http://www.co-operative.coop/contact-us/contact-us-food/ ...?

I have occasionally emailled them about things like 'my local branch puts basil in the fridge and it goes all wilty from the cold, can you stop them doing this?*' and it seems to work really well.

* I had already twice mentioned this to people in the shop and got the 'not my problem' face. One email via the magic form, and shop was reorganised within days to put the basil in a comfortably warm spot.