CYRANO
I would say those timings for NOC look about right but sure I can remember Loganair having it down to 1hr35min many yrs ago. Shaving 5mins off the flight time each way would give it 25mins turnaround in BHX. The other option could be GLY and I had thought WAT too! Also on the point of it being a busy a/c its not unusual for RE to do 4 sectors in a day, on some days one a/c does WAT-SEN x2 and MAN , and LTN.