I just I remember that I was given fairly strict instructions about the timing. I think you could only have a certain amount, you could have TOO much tea.
All I know is that after a big day of shopping I had two cups spaced out about 1/2 hour...... and began contracyions approx 40mins later.

I think I was a 50/50 combination of the tea, and finding the perfect outfit for labour.!