I have a 20m 16mm t & e cable run up boxing through loft and down boxing in ( ref method c) . The new CU I’m coming from has been put in by a cowboy , rough , no certs etc . There is spare ways but I’d rather come of Henley blocks to isol so I’m just signing off my own work . Question is do I fit a 63a rcd at source and an unprotected CU at other end , or preferably a 60a switched fuse supplying dual red CU ? Just bit worried about feed not being red protected ? Any opinions much appreciated