Just been on phone to my brother WHERE he tells me national grid just condemned he's house central heating boiler due to faulty flue fitted
They confirmed boiler is filling house with deadly carbon monoxide thus poisoning him and he's kids.
Is important if you or your kids start suffering no stop headaches you suspect carbon monoxide poisoning.
If your house is effected it can effect your nabour home too especially if terraced house.
Clearly we are not impressed with landlord and so called gas safety checks AS clearly they don't work.