O2 tariffs and minutes info for Palm app

I have a very nice Palm app (SmaatoCost) on my Treo which calculates
calls, remaining mins etc.
It is asking me for info of which I am confused about what is correct
after looking at the o2 website.
Can anyone clarify if my info is correct and help me with the relevant
info:

O2 400 mins / 100 text plan
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Calls
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Mobile to mobile calls: 20p/min
Mobile to landline calls: 20p/min
SMS: 12p each
Data included/month: 100KB
Voice peak: 20p
Off peak: 20p
Weekend: 20p
Holidays: Are the calls billed as Off peak or Weekend?
Peak time: Mon to Fri 7am to 7pm.
Weekend starts Fri at 7pm and end Monday at 7am.
Sat/Sun: No peak time.

Increments
-----------
> Describes how precise your calls are billed und how much a call costs
> at least. For example it is common to fully charge for the first
> minute and 10 second blocks for the following minutes (60/10).
So, would my info on my tariff be 1/1 because I am billed by the second?

GPRS based on data
---------------------
Per session: £?
Per 100KB: £?

GPRS based on time
---------------------
Per session: £?
Per sec or min: £?