To clarify, The drain is at a radiator on the ground floor. There are pipes running in the concrete floor. Need to repair a pipe in the concrete floor. Can't get the system to fully drain to get a good solder joint.
It's hard work to get the lowest pipework dry enough for solder joints, you can try screw on or push fit connectors instead.
@Charlie_L started
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To clarify, The drain is at a radiator on the ground floor. There are pipes running in the concrete floor. Need to repair a pipe in the concrete floor. Can't get the system to fully drain to get a good solder joint.