For all of you that like Brazilian Rain Trees, after some research and info exchanges with @leatherback and others, I have found out that some BRT cultivars are really interesting.
Maybe they are restricted to Brazil only, but I think this info below could help somehow.
1-) First a regular BRT...
I think this is a member of the berberis family i potted this up a few weeks b4 photo taken it seems to have taken off despite the severity of the 2nd winter which started 1 week later. I found this in the guttering of a block of flats 3 years ago.