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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.
Airhead-
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.
rhb
The hose to the bath mixer tap has corroded & split (red circle). We stopped it just in time (was dripping into kitchen but avoided full flood) I need to replace it.
Given width of bath I can only just reach the hose connector with one arm plus choice of spanner at full stretch. It (blue circle) needs two spanners to release but no way of getting under to use both arms to do this.
Any small twist on the hose fitting causes the pipe & isolator to turn, creating a leak from the bottom of the isolator valve (orange circle). The valves are too close to each other and to the wall to get a spanner/basin wrench in properly to tighten or loosen...
Guessing the only solution will be to remove the bath completely? Are there any narrow plumber spanners I could try?
Now I know how bad it is (shonky plumber a few years back) I'll be re-routing the pipe runs & moving the isolators to make these easier to work with in future.