I think a pic or two showing the problem is essential, and the sooner the better.
If the RGI has to visit your loft, it's a big no no, quite apart from having to repeat the trip every year to inspect the flue with the service, there's a risk to you from the products of combustion as well as fire.
If the RGI has to visit your loft, it's a big no no, quite apart from having to repeat the trip every year to inspect the flue with the service, there's a risk to you from the products of combustion as well as fire.