Ford focus mk1 central locking. UK?

I have an x reg mk1 focus, I've always had to use the key as the fob always locks the car then automatically unlocks again. My issue is now the drivers side door won't let me turn the key properly to lock the car manually and it only locks the passenger door if I lock it from the other side. The lock on the inside is completely seized up too. Feels as though it is jammed. Any help? Uk

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