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I don't know much about this but I believe you can tell by the brick pattern from the outside - they are usually laid lengthways with a regular pattern.
However, whether you have a cavity or not, mounting a TV (unless its HUGE) probably doesn't need to be overly strong. I have had TVs mounted on plasterboard on studs and plasterboard attached with dot and dab. Nothing fell off.
Some good anchor type bolts would be belt and braces, I'd probably be too lazy and just chuck a couple of rawl plugs and regular screws in and be done!
andos
Sorry for the really basic question, but I’m trying to determine whether the walls in our extension are solid or cavity. I believe it was built in the ‘80s and measures 12” (see pic).
I want to mount a tv on the wall and want to make sure I use the correct method. Cheers