I for one will stick my neck out and suggest that there will be no pilot redundancies. Why because shorthaul a/c are crewed with 5 crews per a/c whereas longhaul need approx 10 crews per a/c, Now if it is BA's plan is to start up to 20 extra longhaul services then that will absorb a lot more people. I suggest the long term plan is for the LGW 737s (17 a/c) to be phased out and be replaced by an equivalent number of bmi 320s, That leaves most of other 10ish bmi a/c to operate the ex BMED routes. Such a plan is how the shorthaul slots will become longhaul ones. The tricky part will be how the 737 LGW pilots (a lot unwilling) will be handled.
What I have sugested is very contentious but with goodwill could be managed. It just makes sense that the BA shorthaul fleet is one type, most of the 737s at LGW are oldish and also fuel inefficient