BOAC,
Re (a): From Annex 11 to BEA FR:
Stall Warning
At lift-off:
(...)
During any other flight phases after lift-off:
Thrust levers: ... TOGA
At the same time:
Pitch attitude ... Reduce
(...)
Re (b): In normal law, stall warning is not inhibited, but the threshold for its occurrence is set at 23 degrees, whereas the High AoA protection does not allow AoA greater than alphamax (approx. 14.5 degrees at low Mach, 5.2 degrees at M.8) (all in clean configuration).
Re (c): The alpha-floor protection is inoperative in Alternate law (FCOM 1.27.30)