Morris
I think the general rule for copyright on photographs is they are protected for 70 years after the death of the person that took the photo. The trouble is there are so many exceptions to this that can make it less you would need to be a solicitor trained in copyright law to understand them all.
The main trouble is in finding who in fact has copyright of some of these old photos in circulation. I think that as long as you don't reproduce any photo from a protected collection you are fine, and if you accidentally do just that, if challenged over it you can remove it.
So we are glad to see another wonderful photo of The Stonebridge Hotel and I must say it looks at least 70 years old.
Phil