In my humble opinion, we are barking up the wrong tree, well more a case of moo-ing up the wrong tree, with biodiesel, I have to agree that it is a matural step towards climate change action, and not to detract from the original posting, it doesn't stack up for two reasons.
Firstly, to make quality EN14214 the batch size must be kept small, unless you have the manufacturing capacity of these huge plants we see in Europe, which I think we'll all agree takes considerable investment, not really practical at a farm level.
Secondly, biodiesel and bio fuels will only become truly viable when the oil companies, such as Shell, BP etc... can control the market. I'm a sceptic, sorry, but this technology is not new, these guys have a history of buying up patents and the like, and hiding them in a cupboard for 20years so as to protect their own interests, OIL.
What do ppl know about generation 2 biofuels, companies adding such things as algie to fuels to increase the calorific value!?
Anyway, biodiesel at current prices doesn't stack up, unless you want to do what I reckon is best way, don't tell the Government your making the stuff and carry on regardless...!? 
Dolphin