Thanks both, will go through the suggested options.
I’ll probably end up taking to an indie to get this checked out and ask them to have a look at the callipers. Any idea how much that should cost to replace?
Also one point to note, I get the sound when driving off at low speeds too (basically in traffic when car is in drive but I’m not pressing down on the accelerator) so it’s not just when I’m using the brakes.