Modern Fireplaces Is It Ok To Block Off A Gas Pipe, Cover With Concrete And Leave Under A Slate Hearth For A Wood Burning Stove?

Is it ok to block off a gas pipe, cover with concrete and leave under a slate hearth for a wood burning stove? - modern fireplaces

Installation is a wood stove in a modern fireplace with a gas fireplace. A gas engineer today and said it would be cool to weld the pipe end is buried in the leaf, we need to unify behind the fireplace, then we put slate of 50 mm at the tip. Is it a safe method? There is still gas in the pipeline, but it is a stalemate.