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Valiant combi pressure drop when cold?

is it normal for a combi boiler to lose slight pressure over the summer when the system is off. I have had leaks in the past with much more dramatic fall in pressure but i am obviously worried i have a new leak.
Wayne, June 2006
around 0.2 - 0.4 bar over a few months

wayne, July 2006
IT WILL LOSE SLIGHT PRESSURE OVER A FEW MONTHS.BUT WHAT ARE YOU CALLING SLIGHT PRESSURE.

HI-SPEC PLUMBING, June 2006
link Click here to see other fixes for Vaillant.