I have a 99 GS300 SE (mkII) and it is due its 63k service. I've phoned around a bit and got varying responses for this service from £300 to £600. Can any of you guys advise what sort of price I should be paying (Toyota or Lexus service centre) and what is included? Some have said timing belt change, others have not. Some have said new spark plugs, others have not. I'd appreciate any advice on this.

This thread should help.

Timing belt and plugs should be replaced at 63k for a '99 GS.

63k Service