Thank you for responses guys, much appreciated. I had bad experience in the past when was buying vw passat, DVLA results were positive, car was clean inside and outside, however after 3 months of driving- rear arch started rusting. Went to VW dealer and they identified (after very deep inspection) that car had an accident in the past. They told me - that somebody smashed it and re-sprayed. I must admit - neither me, neither my friend couldn't spot that, somebody made nice re-spray job :) Anyway, I sold it eventually.
I really worry buying this car as it is performance car and with such a low
mileage this look damn cheap to me (maybe because of colour such a low price :) )
I may try contact Subaru dealer and ask them if they can check their
database about any registered issues with this car, but this will be difficult to check. Impreza WRX was one of my dream cars, but I couldn't afford it due to insurance cost, but now I am 28 years old, so insurance price went down a little :) from 1800 to 500 :)