Firstly haggle like an arab vulture. Insist on technical inspection. Use technical inspection report to haggle more. Proceed to traffic police and fill out forms. Whilst waiting in queue have another opportunity to haggle again like a vulture (standard middle east practice). Hand in paperwork and receive new car registration and use this last opportunity to haggle again. In the midst of haggling you may be told to 'feck off', which esentially illustrates that the seller thinks you're low life scum and therefore no longer wishes to sell the vehicle to you. Walk away at this stage with any respect you may have, if any.