You probably realised this a long time ago, so I apologise for boring you; but if you didn't know this, maybe you'll be interested as I was.
English people (maybe others too) have a very precise timetable for drinking their daily caffeine. Many people who I have asked have told me that the follwing is their daily routine, so if anyone says "do you want a cup of tea or coffee?", then they will always know the answer without thinking.
When you wake up: tea
The rest of the morning: coffee
Immediately after lunch: coffee
The rest of the afternoon: tea
After dinner: coffee
The rest of the evening: varies I think, it's unusual to have coffee late at night, so maybe a tea or even a fruit tea, though I may be wrong
Having found this from many people, I remembered that in the materials department, they sell coffee in the morning (unless you ask for tea, as I do) and tea in the afternoon, which backs up my findings.
Is the system I have described accurate or complete? Please send you comments and corrections, as I am not sure
I am weird on this score... I only drink tea anyway, so I never have to choose!