After leaving B.Gas Homecare after 15+ years, I decided to go down the private route.Alex was recommended to undertake a gas safe on a rental property. He did this and gave a Gas Warning Notice with a DANGER DO NOT USE warning. He stated that the "Boiler flue terminal too close to an opening window", due to the windows being less than 1200mm from the flu terminal. Clearly concerned I advised tenants to keep all nearby windows closed and to not use the boiler. I was surprised at his findings as B.Gas had undertaken the same inspection for the previous 15 years. I raised a complaint with B.Gas as they had not noticed the same issue, and this over took 2.5 hours. I organised for the engineer who originally installed the boiler to undertake second inspection. After detailed measurements, i.e. opening the velux windows and using a tape measure, he found that all windows were over 1200mm away from the flu terminal. Alex's findings were incorrect. After emailing Alex he stated that he used a "Dewalt digital laser distance measurer" but did not open the windows. He also stated that he used his "engineering judgement and look at each scenario". If he had opened the windows, as he should have done, he would have found that the installation was within the guidelines. I wasted a lot of time and effort with B.Gas, Tenants, 2nd engineer and chasing Alex due to his incorrect findings. I am now chasing Alex for compensation via small claims court. I WOULD NOT RECOMMEND.