First of all wait for the F-A-C-T-S
Secondly the Avro Rj 85 can be flown with "split" controls. In other words if the Capt's or F/O's controls block, they can be disconnected and be used independently.
Thirdly, not all the Avro's controls are mechanical. ELEV and AIL yes, but the RUD is hydraulically actuated (yes you can still force it to move with brute leg force).
And last but not least, if the ailerons block and you've only got rudder and elevator, you can consider slitting the elevator and using both surfaces independently to roll the A/C (works in the sim). This needs a co-ord kid or a great team.
Left column forward/right column backwards = RIGHT turn and vv.
And really last but not least: The crew did a GREAT job, irrespective of what happened. Typical LH