AdWords API Getting report data for timezones other than Los Angeles time

Having read
http://www.google.com/support/adwordsapi/bin/answer.py?answer=15140, I
am specifying start and end times of 1200 GMT for my reports. But, if
my understanding is correct, I believe I have the problem that a
request for a report for a given day will return data about clicks that
occurred in a 24 hour period starting at 0000 hrs in the timezone
corresponding to Los Angeles (i.e. Google time), rather than for the
timezone I want (which is usually London time).

Does anyone know how I can get the API to consider each day to start at
0000hrs in some specific timezone?

TIA,

Ian Sykes