Colleague has a house built in the late 60s and asked an interesting question. The 4 sockets in the lounge appear to be spurs rather than a ring main and I assume connected together in a box somewhere as he thinks there is one cable going to the fuse...although to be fair I suspect he is mistaken and there are 4. he had a new MCD fuse box fitted 3 years ago. Question is can he replace this spurred system like for like ? He is reluctant to have the floor downstairs and upstairs ripped up to put a ring main in and is exploring options and is hoping that the existing cables could be use to pull a new cable to each socket. Is this allowed under current regs or is he forced to have a ring main installed ?