Pretty much all routes ex BHX are within Q400 range and gradually as the E145's are retired and replaced by Q400's its likely that more routes will transfer to the Q400.
You have JER/GCI/NQY/IOM/BHD/GLA/EDI/INV/ABZ + BES/LRH/EGC/CMF/CDG/BRN/DUS/HAJ/HAM
FRA/MXP and STR tend to be E145 domain but this will change overtime.
Hope this helps!