I haev no idea what these guys are like to deal with. But they claim to have a grill shell, not yet chromed for under a hundred bucks.
The link to the part is:
http://www.englishparts.com/products/MG/1952/MGTD/GRILLE–RA DIATOR-SHELL–PAINTABLE–ZINC-PLATED–/2986306/10830/454-170 .html
It concerns me that they do not post a photo. But who knows, it might be worth a call. (404) 299-5775
Former Owner of a 1981 Classic Roadsters Ltd. Duchess (VW)
2005 Intermeccanica Roadster
If you own a TDr and are not in the Registry, please go to https://tdreplica.com/forums/topic/mg-td-replica-registry/ and register (you need to copy and paste the link)