It's easy, there's just a few things you need to know.
Bought the minidisplay to HDMI cable off ebay for about £6.00. Pluged in both ends OK. Had to disconnect the recorder first. Might have to look at some kind of splitter so I don't have to do this every time.
Select the HDMI input on the tele.
At first the TV will only display the basic Mac background picture (stars) You need to 'Mirror' the displays, and sort out the sound.
Go to 'System Preferences' and select 'Displays'. With the Mac plugged into the TV you get an extra tab (Arrangements) at the top of the box. Select 'Arrangement' and check the 'Mirror Displays' box.
Next from System Preferences select 'Sound'. Both 'Internal Speakers' and the TV are listed. Select the TV.
All should be working now.
HD video without Blueray - result!!