hi timo,unfortunity your in a bit of a pickle here.first of all tell us a few things.
are you paying the vrt and reg fees
are you giving a warranate with the car
is the car going to be serviced,timing belt done and full valet
because all these things should be done from a garage.
ver 4 type r are going for 12500 upwards
ver 5 type r are going for 14000 upwards all depending on model and extras
there was a lad on the site there trying to sell his white ver 4 type r for ages with no luck and had to sell cheap with full rebuild and extras and tax and nct
but good luck with the sale