I think you did the right decision. I would rather advise you to look out for 190SL Convertible (any model between 1950-1972) . Actually my brother has one in UK, parked in his friend's garage (belongs to his friend's grandfather) and the price is also 4000 pounds...but the problem is how to get it to Pak. If you have right connections in UK, you can get most of good & classic cars within 3000 pounds + freight 500 pounds( doesnot matter even if one has to pay some extra money)....but the qusetion is can you really bring that old car to Pak?
Good luck and best regards.