You could try to have the internal works done separately, but it may not be worth the trouble. I live in the Brunswick Centre and our heating/hot water system was replaced in 2009. The internal work wasn’t done to a great standard, but it was all right. The problem was in the main boilers or the distribution system (we have never worked out which, and Camden has not volunteered the information even when the issue was before the LVT). The system has broken down hundreds of times (literally) since installation, although not every breakdown affected every flat, and only on a couple of occasions was the problem something inside our flat.