Sadly mate it will take another incident for them to do anything, this hot water/central heating system is a ticking time-bomb, and not to just go and have a look is a gamble with the occupants' lives and anyone unlucky enough to use this shower. It is so wrong, but again sadly it doesn't surprise me.
Perhaps if someone looses their feet or their life, they might go look....

I hope this system has been changed, but as far as I know this is how I saw it started to be installed (I left not long after) and how my old apprentice told me it was completed....by a guy gifted his full certifying licence for gas and an exemption to install hot water....but he got away with facing a charge for an explosion that nearly killed someone, so perhaps this one will go away in the same way....