Glad you have located one, Julio - I had a Brooks saddle a few years ago, and the correct spanner certainly made adjusting the leather tension much easier.
I have a tin of the Brooks recommended leather treatment wax stuff - boot manufactures, makers of leather goods etc always seem to recommend specific treatments for the own products, and I wonder how much difference there actually is between all these leather treatment / preservative creams and waxes. But if you want it, pm me. I no longer need it.
Lewis