OP,
You show a "Fan Gas Isolator" - the fan lever is in the on position but, as above, the valve is capped.
You dont say, or know if the pipe is live - better not to have a gas pipe, live or redundant, below your floor.
Best practice is, as above, to isolate the line at its mains gas branch-off, & if possible to remove the Cu pipe.
Where is the gas meter in relation to the Fan gas isolator?