On Aug 2, 12:29*pm, Rob wrote:
With access from the inside, and about a 3mm view of the 'bolt' between
the striking plate and the door, what's the best and least destructive
way of removing this (lost key) external door lock?

Thanks, Rob

I suceeded in removing the hinge pins on my daughter's door but it
still wasn't possible to get the door off with it locked.

I used the dreaded angle grinder in the end and fitted a new lock.
This was far quicker than removing the hinge pins.