Thats a cruel trick to be played on a Black 5, couldnt you persuade him to have a B1 instead. :-) At Burton last year saw a large scale (G ?) Stanier 2-6-0T work of art that took the owners father many years to build. Was confused at first in trying to identify it as it was in LMS red - which dont think they ever carried. However it 'looked' right in that livery, hence initial confusion.
Cheers, Simon