Rented flat, about 6 months old (or less). Single lighting circuit - B6 MCB had tripped. I reset the MCB without any apparent problem, so I replaced three blown 240V halogen bulbs (lamps). I then checked the RCD (MEM 80A / 30ms) with the yellow test button - nothing happened. Switched RCD off - all protected circuits went off. On again - all circuits energised again. My advice to the letting agent: 1. Either the RCD or the earth path is faulty. 2. A qualified electrician should be called to replace the RDC and/or fix the earthing. 3. Urgent action is needed, because there's a risk of electrocution if an ECP becomes live. Was my advice correct?