Getting condensation on the other side of this wall and trying to work out if it's the rendering covering the damp course or something else?

Survey did flag that the render was covering damp course, and could be an issue, but trying to work out if that's the issue or something like insulation or something else. Want to work up from the cheapest option, conscious there's lots of damp survey companies that will try and sell more than what's needed. I really hate the pebbledash but know it'll be time consuming and expensive to remove/could be hiding the brickwork underneath. Pretty new to all this so working out what the options are