I answer my own questions all the time nowadays.

Had 8L of fuel in the tank (max filled up to 37L when I just filled it up at BP with 98 RON) , water had obviously settled due to condensation, to the point where i assume the water to fuel ratio wouldn't have been very nice.

Got the engine to operating temperature, which would have caused the water to evaporate in the cylinders, and then just topped it up to a full tank which would have diluted the water.

I'll check my fuel filter anyway, as that hasn't been replaced in quite some time.

Mods, close.

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03 STi @ 280hp/1.3bar