Eastern
What about Eastern. Could they not make a daily return possible with a triangle operating CWL/BRS. I can't imagine the loads are great to CWL. How about a NCL-CWL-BRS-NCL on a morning another in the evening. Assuming a 0645 departure, you'd arrive in CWL at 0745 and BRS 0830, and in the city centre by 0915 onwards.
On an evening a late afternoon departure could work. It would help increase Eastern's utilisation. What about sending the BHX on to BRS on a W pattern or operating it as a triangle.