VW replaced the spark plugs on the 2.0T every 40,000miles, if your remapped I would highly recommend as preventative maintenance you swap the plugs every 15-20,000 miles.
I was getting a random multiple missfire at high-ish speeds during WOT in 5th/6th, everything seemed fine in the lower gears. I did the obvious diagnosis with coilpacks which didnt fix it so went onto spark plugs - although the one's in there having done only 15k miles! Anyway swapped and now the car seems to be running fine again with no hiccups so far.
All 4 removed plugs look the same and dont appear to look 'bad' in any way.
FYI, plugs are £9.50 + vat each from VW