Take the next section of floorboard off and see if there is a bend or something to give you a bit of movement. Then cut through and put a joint on. You may need to make room by chipping a bit mor out of the joist. Don't set the place on fire if you use a blowlmp.
PS tha's not a nick !!
PPS What you need is a "slip" connector - you can slide it past one way, line the pipes up and slide the connector back over the joint.
It's the cold water supply to the sink and bath (and maybe other stuff but didn't really need to investigate further.
I fixed this by spacing the pipes further apart by making the cut in the joists wider across three parts. This gave be enough room to remove a section of the coper pipe and 2 compression couplers.
It's not ideal but there is little 'strain' on the pipes and the boards are back down thanks to a little groove cutting with my router.
A very silly slip caused by complacency.... It wont happen again!
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