Flybe Training Academy still do perform the BAe146/RJ B1 & B2 type courses. Unfortunately, a 146 B1 course is on the go right now but if you call this number below, ask to speak to Mr P. Swain (Manager) or Mr S. Chester (146/RJ instructor) at the Training Academy, I'm sure they can advise on spaces/costs & location for the next one.
Additionally, I recommend the B1 course. He knows the aircraft.
+44 (0) 1392 366669
Flybe.com - Technical Training
Regards
BAe146