Thanks for that 'Link' == I have sent them an e-mail query.
I use Neatsfoot Oil on various leather items, but in your case I'd look into the products used to treat leather book bindings. I think many/most are beeswax based (as benjiboy suggested). Surely no lack of old, leather-bound books in your part of the world.
We have been selling our Neatsfoot Oil for the last 40 years without any complaints. We have always made it blended because dealing with pure Neatsfoot can be a nightmare. It can turn very solid in cooler temperatures and this makes it difficult to soak reins etc in. We have used the blended Neatsfoot in our own extensive livery yard and never had a problem with dissolved stitching. For preserving leather, we could think of no better product.
We hope that this information helps
R P Newsholme
Just because it's a blend doesn't mean it's bad (depending on what it's blended with). I had some that I swear was blended with kerosene.