These sort of locks are garbage. A few hard shoves with your shoulder and they can give way.
Are people in this country any different? I remember the Toilet roll shortage not so long ago (lol)
That looks good, cheers for sharing. Shame my back door opens outwards
From that last statement, it seems you need to make sure your door frame needs to be strong, else the door jam will be useless. But as I do not have the jam, or have even seen one before, I am probably missing something. If it works for you, and you feel safe with it, then I wish you well.
Better be paranoid then stay with wooden, weak door frame and doors being installed to be opened inside instead of outside as common sense tells. Typical UK craftsmanship.