Drill plenty of holes in the floor.
Saves weight by removing metal and stops it getting any heavier should it start filling up with water (a well known Landy defect).
 
Kick that fat lass out of the passenger seat. As an added bonus, your Dicsovery will be quieter too!
 
As far as I recall the seatbelts are rather heavy too. Take them out, the law says you dont need seatbelts if your car is light enuf.

Also replacing all the glass with cling film will save much weight and because its so light it will be safer too.
 

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