I am having problems with my door lock not unlocking, should i buy a genuine part from landrover costing £116 or a lock from john craddock for £60

Hi,
or a far easten one for £18 (no) a second hand one for about £25 (thats what I did) or even just the motor for £5 (you want one with the worm wheel attached)

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my first ever FL2 and I did keep it longer than most other cars!
But its now gone way up Norf