[ubuntu-uk] Dial up (kubuntu) help please?

[alan c]

I need to configure dial up (to waitrose.com) (note1) using my 
external serial connected modem.
Using kubuntu kppp is offered, and I can get as far as apparently the 
point where the waitrose machine is authenticating - I think, but then 
a kppp error occurs.

Is anyone out there actually using dial up - maybe to waitrose?
What logs should I be looking at (and where?) to see what is going on?

Note: my usual connection is adsl etc but there are occasions when I 
need dial up.
tia
-- 
alan cocks
Kubuntu user#10391