These 4 phones are probably working but I’m not so sure about the Panasonic. Three were given to me so I can’t vouch for them. The BT Duet is definitely working (It’s not DECT).
They can be plugged into the normal socket or into a router equipped with a phone socket.
Landline phones (Langwathby CA10)
This offer has been gifted to someone and is no longer available.