OK Gas & Heating Engineers of the SMB....need your advice. Bought flat in 2017 (Bryant Homes built in 2006) Has the same boiler in since built- no issues. Works fine. Serviced before we bought- no issues raised. We are now looking to sell and engineer has said boiler is fine, but flue is too close to opening window. He has stated new boiler required. I measured the flue today, it is 280mm from the window (minimum 300mm). Replacing an entire functioning boiler for 20mm seems a bit OTT. My question is: The boiler was installed in 2007 before 2008 regulations- do they apply to it now? If so, can we not just put a flue diverter on to take it 300mm away from the nearest opening?