Apologies for my badly worded post, the landlord and his own office staff were responsible for maintenance issues and the rent but he's now hired an outside letting agents to deal with the rent and maintenance. I did check with his staff who was my point of contact from now on? right away no hesitation they said it's this new letting agents. I contacted them myself and was treated like an idiot, the regular plumber/engineer was happy I at least made contact but somewhere between himself and this new letting agents and the landlord/owner there is something going on something I'm not privvy to. The issue with the boiler is apparently a dirty system which was reported to the landlord by the plumber/heating engineer before these new letting agents were hired. Now it's the PRV which the plumber/heating engineer wasn't given the go ahead to fit by letting agents.
I'm not afraid of landlords or their staff, the plumber/heating engineer I can't bad mouth him because he's the professional in that trade. My wife loves the flat, she's got a sizeable balcony with a decent view and we are great tenants but she doesn't want to move or for me to kick up a fuss. Here is a pic of the boiler, the drip is far left which according to the boiler service and fitting manual is the CH flow isolator next IV (isolation valve) is the gas inlet connection 22mm & isolator. The 3rd IV is DCW in isolator and last is the CH return isolator.
I just want to replicate what he showed me to isolate the water to the boiler causing the drip, then I can take the issue further with the landlord and letting agents.