Re: best solution!
I've been there. And Malaysia, and yeah, there isn't much natural habitat left. Then again we can talk - UK forest was systematically destroyed to the point that it is today in our quest to industrialise.
Another 6 hectares for UK banknote production (read the consulation, that's all they'll need) won't make a blind bit of difference either way. This whole tallow thing is Parkinsons law of tiviality (the bike-sheds at a nuclear power plant argument) on steroids.
I've submitted my response to the consultation saying as such. I had no idea there was even a Jain network in Great Britain, let alone the fact that a religion compromising 0.039% of the population should force a change of Bank of England industrial processes. How about they stop using everything made of or utilising polypropylene before they start weighing in on the debate? Relgion is a lifestyle choice, just like using contactless. And the vegetarians soon shut up once they realise their home-cooked meal contains more human flesh in parts per million than banknotes contain tallow, because they were stood sweating and moulting and flaking over it whilst they were cooking.
Then there is the fact that this costs for making this entire argument and collecting responses is coming out of profits which otherwise go to the taxpayer.