also have a good smell in the car for antifreez,take out the front foot carpets and feel for any moist and around the center console,the heater matrix tends to leak,the part will cost no more than £50 but to replace it you need to take out the whole dash.done mine and its not a pleasent job but its worth it-not paying £250 to £500 for labour.also check the abs and airbag warning lights,they should come on for a second or two when u start it,if they stay lid,not good.rust is the main thing to look out for,take your time and dont rush it.i love my vr to death but bad mpg comes with all the excitement and insurance is mad even on third party,fire and theft.
good luck my man and report back to us
anthony