I have a seven-lever Yale type lock, but it is connected to the door handle. If I lock the door on the outside, it locks on the inside, and vice versa. If I want to allow people to get in, it has to be unlocked. The door handle works from the outside and inside.
I agree with you, roses, that that sort of lock might be ideal for my door. It is the sort that fits on wooden doors, and we used to have on the guest house. However it creates its own problems.
We also had that type on the house we had before that. When we had a break in one day when I was out, the thieves had locked the door on the inside so I could not get in with my key. I had to get my next-door neighbour to break in for me so I could find out what had happened and ring the police!