Thanks everybody!
All good information.
Guys at the workshop looked for any dead animals, didn't find any. Cabin filter was replaced 2 months ago by myself and the mechanics checked that place also - nothing out of ordinary. I'm going to check the windscreen washer system - although I topped it up few weeks ago, the nozzles do seem to be a bit clogged, maybe there is something up with that.
About the smell intensity - the sulphuric smell is not always there. If I sit in the car in the morning, I can't smell it but it comes up suddenly while driving. Sometimes I haven't noticed any regularities with it but I'm trying to. It seems that you get use to it and after a while it doesn't smell so intense. I'll keep you updated if I find anything.
Transmission and rear diff fluids were changed about 35000 miles ago. So another change/flush is my plans but hard to believe that the issue is there, but who knows.
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