On Sunday, 5 February 2017 18:04:57 UTC, Mr Pounder Esquire wrote:
Last night at about 9PM in the dark there was a knock at the front door.
People never seem to see the door bell.
It was this dairy guy asking me if I'd like him to deliver milk. I politely
asked him if he could tell the time, he said "Sorry" and cleared off.
If this had been 5 or 6 VERY big lads intent on no good I could have been in
trouble, even though I'm a big guy.

Question is:
Are these door chains that can be screwed into PVC doors and frames any
good?
I can't see the screws holding out against a good kick.

Thanks

Google door restrainers.

What you want to consider is either a peep hole thingy or a video camera/audio link. You can get ones that bring up a picture on the TV. Plus a recorder if you want.