Generally speaking, here in the USA, anything copyrighted before 1924 is ok to use. Exception being if the copyright has been renewed. There are different dates for copyright expiration--according to what category is copyrighted.
But, no one else can put a copyright on someone else's original work. So....the website that says it is copyrighted by them online is not correct. However, the rules for this may be different in the UK--but I think they are generally the same. The only parts that the .com can copyright is their own original work, such as their own wording, their own photography etc.
Copyrights can be assigned to others, but only from the copyright holder.