There seems to be some misunderstanding going on.
I primarily wanted some technical opinions about the issue, whether it's likely the DSG gearbox/transmission/mechatronic's typical failing sign or something else,and to get some confirmation whether I did the right thing not going ahead with the purchase.
like I said I never owned an A3 or any car with DSG,so my knowledge of these cars issues is based on YouTube buying guides and other online forums. and I assumed this being an Audi owners forum will be a good place to get some more model specific information.
when I test drove the car and noticed the noise,I immediately made my mind, but next day I kept thinking maybe I was too picky and it was something benign like what dealer was saying (car being cold,dirty injector,resolved by engine cleaner etc etc) hence why I posted again to know other owners opinion.
like I said the car was otherwise in REALLY nice condition and in the past 2 months of search I haven't even found one that was worth going to test drive.
as for the ticking all boxes,there are things that I can ignore on a used older car such as right colour,seats,trim etc but there are things that are necessary for me such as being 5 door (not 3),being automatic,petrol,1.6 litre engine (as opposed to 1.4/1.8/2L that use timing chain instead of belt).add to that full service history,proof of recent cambelt/water pump/clutch replacement that this one had.
this one had them all that's why I didn't want to let it go unnecessarily and start the boring, endless search again.based on my past 2 months search it's very unlikely to find another one with all/even most of these good points.
considered RAC and AA inspection but they wanted £260 and to be that's too much to waste on a 11 years old car for inspection.maybe ok if it was a £10k+ car..
anyway I'm not considering that car anymore.