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Thanks for this. Water off next step back is whole house, but will have to be done. If I get the valve out the way i guess i can use a pushfit elbow joint to create a 90deg bend and then run the pipe a short way horizontal, link to isolator valve then another short pipe section to attach the new hose to.
Trouble with spanners is the clearance between the pipes & valves means hard to get a grip and twist even with better reach. I think you're right to get loose what i can as that brings me the required separation to work on other bits. Ta.
Maybe disconnect the water supply to the ball valve and take whatever will come off (seems like top half of the ball valve then reassemble with new flexible pipe and reattach. Pretty much anything you do would benefit from having the water supply off before that valve by the look of it.
You could use a bit of pipe taped on the handle of an adjustable spanner to get a bit more reach. Very long spanners must be a speciality item but still available.