all of the above, plus others,,,
are there many 'cheaper' suppliers about ???,,, imagine if asda made speedway bikes :-)
inclined to agree with you about supermarkets driving prices down, they have that power, and the majority of shoppers behind them,,,
speedway hasn't got that :-(,,,
but on the milk thing, maybe they needed a kick up the bottom also,,, if some of the public seen how their 'cheap milk' was produced, they might not mind paying £1.50 for 4 pinta ;-)