So I just mounted my TV on the wall, but the studs were in an inconvenient place (and I'm not minded to cut into the wall). After a bit of research I decided I'd use 10 hollow wall anchors, like in the picture, rated 50-100KG. I I figured that's at least 500kg of potential holding power in there. The TV is about 11kg and the bracket is probably about 2-3kg.
Basically I'm posting hoping that people who know how to do DIY can reassure me it's going to be fine and not come crashing down.
The rating of the anchors means very little if the plaster board you're screwing them into is as thick as card board, that's just something to bear in mind.