3. "Pitman said that when Boxhall called him it was within a few minutes of him (Pitman) being due on Watch, Pitman was due on Watch at 12-24 am April 14 time. If nothing had happened, then when Pitman went onto the bridge to start work, the time on the bridge clock would have been Midnight, not 12-24 am"
Sorry, JIm, but I'm not sure of what point you're trying to make?
Simply that Pitman would never have made that observation if Boxhall had called him early or late. His remark is proof-positive that a partial clock chnage had taken place before he was called.