I just had to have the ceiling replaced due to a leak caused by a fractured solder joint in a pipe (which was repaired) but when the ceiling came down, we found a disused pipe which appears to be capped off with a radiator tap or valve. We moved in a couple of months ago and have an unvented system pressurised at 1.5 bar. I’m a bit concerned whether this is a proper way for the pipe to have been left. Unfortunately the plasterer showed me the photo after he had repaired the ceiling. Is it only a matter of time before we get another leak or is it safe to leave it alone? I’d appreciate any advice thank you.