OK, here is the thing with the car now:
I have covered 900miles so far from the hg change, and as i told, the engine is still lossing water slightly (in these 900 miles the water level in tank has dropped for 4cm or so).
I will for sure first try to go with inlet manifold gasket change and look for any other signs of leak - if this wont sort it out and the water will still "collect" on left hand side of the engine (standing in front of the car and looking at the engine) i am asking if it would make any "sense" to tighten the head screws for half of turn or so or would this be pointless???
Since i am highly doubtfull in HG fail, as the coolant started to appear on the car immediatelly after HG was changed i dont think it's the problem with HG!!!?
And also, i noticed the leak is caused only when engine is cold, once it's hot there is no sign of water on the block, only when it's cold??? Is this any sign of inlet manifold gasket or no?
The car runs totally fine, no mayo, everything perfect....
And one more question - can you name this part on the picture for me - i need to get the gasket for this "VVC motor mechanism" or what do you call this, since it was removed during service but got no new gasket in the set, and the old one is "leaking very little"...