Well, our very expensive (£150ish) lock got stiff and clunky over the weekend. It is 18 months old. Banham suggested WD40, which we used; it worked like a dream for 5 minutes. It now won't open at all from the outside. Luckily, we have a back door we can use. Banham are going to charge a lot of money for a call out. Does anyone have any experience or ideas about what might be wrong? In my view, it ought to still be under guarantee but apparently not.
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