I have heard so many cases of "native speakers" being drunk or having severe hang overs while on their jobs
I refer you to Dr Frank (Bryant) in Educating Rita...
"Drunk? Of course I was drunk - you wouldn't expect me to teach this crap sober, would you?."
I had a rep for being smashed in weekend classes - because the prof insisted I take extra-murals, when Nottingham Forest were still in the First Division and playing Saturday afternoon. So I got my revenge by having a Saturday liquid lunch. Generally the day went downhill from there :) (Un)happy days!
PS Kedzierzyn-Kozle is a rat infested hell-hole and needs flattening. Whatever are you doing there? That's no place for the British - come up to Gdynia; plenty of work here for natives and Thomson Reuters etc :)