I gave a presentation to some supermarkets recently on this issue. Very briefly:
Brazil has plenty of GM free soy available and as the industry starts to pay realistic premiums Brazilian farmers are willing and able to meet a 0.1% threshold. Imcopa ship around 2.5m tonnes of nonGM to EU and Bunge ship 500,000t to UK
Its certainly a curiosity that the EU poultry industry still uses GM free rations when the pig and beef industry use GM - but its not penalising the UK producer because Brazilian and Thia producers wanting access to the EU market also use GM free.
The additional cost to the producer of GM free ration is around £20/ton (but does fluctuate with highs of £50 and lows of £10) which equates to around 3p/kg of chicken meat. That is a significant burden to the producer but before everyone gets very excited it needs putting into the context of the huge increase in the cost of rations due to recent global increase in prices of grain and oilseed - about 25p/kg of chicken regardless of GM or GM free.
The point is that the industry can't afford soya - GM or GM free. To get bogged down in an argument about GM free soya costing 3p/kg, when the real issue is that the industry can't afford the increased cost of rations, is madness
Also, I would suggest that any producer who believes he/she will retain any savings from switching to GM rations when the supermarkets work out the costings is being incredibly naive.