The letter to Sir Terry Leahy, chief executive of Tesco, was from a Jersey cow called Buttercup and it warned that unless there was an increase of at least 4p/litre in the milk price, she would end up as a beefburger on the stores' shelves.

A Tesco spokesman said the demonstration had been good-natured and the letter had been passed on to Sir Terry.

Meanwhile, a group of 25 Scottish farmers has written to every dairy farmer in Scotland, calling on them to support a campaign to invoice their milk buyer for an extra 4p/litre.

Source: fwi.co.uk