Whilst I am in agreement with your post Mike, unfortunately the tractor mark was devalued shortly after its implementation when some Dutch farmers successfully applied to use it on their vegetables. There is a disconnect (some might use the word 'dishonesty' in this context) between what the people think is meant by a label or marketing claim and the standards they think ought to be applied. Take for example McDonald's advertising using the term '100% British and Irish beef'. In addition to the point you make above they only need to source a tiny percentage of their meat from Britain for this to be an accurate statement and this could even be beef that has simply been moved across the border to Northern Ireland prior to slaughter.
I purchase meat from two local farms run by people I trust. Thus, though still not 100% guaranteed, I feel that I know the origin of the meat, the welfare standards under which the animals have been raised, what they have been fed and what standards have been applied at slaughter plus I have the added bonus of supporting the local economy. Such meat costs a little more (not the inflated supermarket organic premiums though) but this is easily balanced by eating less meat over all.