I have now worked out how to do this and it has solved the issue. I am now seeing messages on my TV.
If anyone else wants some guidance (I accept no responsibility for these instructions) I found this page gave me the solution to enable adb on my TV:
I then downloaded the command line tool for the PC from:
Then I opened a command prompt on my PC, set the path location to the folder where I had extracted the tools (cd \Temp\platform-tools), then entered the command given by rogro82.
I had to accept the connection on the TV to allow my PC to connect to it.
Hope that helps anyone else that wants to try.
