Get Lexus Sidcup to request Lexus Hadfield to stamp the Service Book so as to warrant that the car has been fully serviced by Lexus.
Get Lexus SIDCUP TO CONFIRM IN WRITING THAT THEY ARE SELLING YOU A LEXUS APPROVED USED CAR
Get Lexus Sidcup to give the car an immediate full service and a 12 month warranty and you buy the car.
You take out a Lexus Extended Warranty for 2 years
If after 3 years ownership you wish to keep the car, then renew the Lexus Extended Warranty
If after 3 years ownership,you do not wish to keep the car, then sell the car which will have a fully stamped Lexus Service History.
Good luck Shahpour.