Door lock for 1st gen daihatsu sirion

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My driver side door lock doesn't stay upright when unlocked and so it will always lock itself.
Last year i pass my MOT despite this but this year i went to a new garage and they say they refuse to do a MOT untill i get this fixed.
Has anyone else encountered this problem?
Currently i need a new part for it which is in back order.
Just getting frustrated by the whole ordeal as i went in for a MOT and now i need