What AL did that day is outlined in AS book. He did have meetings all day, but left the office twice - once to go to a meeting, the other to meet a friend for lunch (female IIRC). Sadly, there are no details about where the meeting or lunch had taken place, nor were any timings given.
AL also phoned Suzy's office that afternoon at 4.40 and left a message, but again, there are no details of what this message was about.
AL, together with MG, were at Fulham Police Station that evening at 10.30, and AL was questioned until the early hours of the morning.
AS states that it took a lot of work and several weeks before the police confirmed that all of AL's alibi's for the day checked out, and he was confirmed as having no involvement in Suzy's disappearance.