tiling plasterboard

Split face tiling on plasterboard, if I take some off would the plasterboard hold a tv on the wall too? It is located on the outside wall so would it be best to drill straight into the brick to be able to get the tv up?

I'm about to have our bathroom renovated and i'm assured the plasterboard wall can be tiled over without a problem. Is that correct? The wall is subject to mould and damp, which is one of the reasons i need to have the work done in the first place, and i'm jittery that tiling on plasterboard...