Hi my Samsung TV keeps tripping out as soon as I turn it on I have recently put it in a recess in the wall, I'm wondering if it is overheating ? Many thanks steve

We aren't there to see how hot it gets... but if I have to guess it's a definite maybe.

Far more likely if it's a Plasma, less if if its an LDC... lowest likelihood if its LED... because of the heat generated by them respectively.

How much space around it and bejind it does it have?

Samsungs have had a problem with bad capacitors.
Go to Youtube and search "Samsung capacitor".
Good Luck
Some caps are noticeably bad(bulging) other are not.