On Fri, 30 Apr 2021 12:25:05 +0100, "Brian Gaff \(Sofa\)"
wrote:

I wondered if perhaps they have levers that have to be locked by the old
double turn of the key, which would make it very hard to get locked out if
you don' have a key!

Brian

My fondest hope is not to be locked out without a key, so thanks for
the tip.