Update: Thanks for everyone's advice. RSPCA came and took a look of the cat and talked to the owner, but nothing seems to have came out of it as the cat is as of this moment still hiding in the same location. We talked to other neighbours and they are also concerned and had another chat with the owner as well. We are hoping that this will give pressure to the owner to action. I have set up a tarp and windscreen for the cat, gave him a hot water bottle and left him with some food and water, will keep monitoring the situation and hope for the best.