I think it depends if the dent is under a second skin part way down the door. It's it a few years since I replaced my N/S doors but I do remember thinking, they can't easily be repaired if a dent is under that.Welcome to the fold,
I use Gary at B&F Autos in West Hounslow for my oily bits, I wouldn't mind betting that he would have a good A2 conversant body man up his sleeve. More pics would be helpful, it looks as though there may be more to it than an initial look at the photo would indicate. These doors are not that easy to access for your normal dent man, IMHO.