In most cases you can reuse the old nut and olive.

To use the new one you have to pull off the old olive and nut, several ways to do it.

Use an olive removal tool.

Grip it with pipe grips twist and pull.

Carefully cut the olive at 45deg with a hacksaw almost to the pipe and fit a screwdriver in the saw cut and twist to split the olive.

Call a plumber! :D

The new nut is pushed on followed by the olive the joint assembled and tightened to crimp the olive onto grip the pipe.

Lots more on youtube if you want to have a look.

If the olive has bitten so hard on the tube it has distorted the tube and created a waist don't change it unless it is impossible to use the old nut as removal will be very difficult.
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One final question
I have measured the thread at the cistern pipe inlet end where flexi hose connects to toilet to be 25 mm

Not sure which flexi hose to go for is it

22mm x 3/4 x 300mm or

15mm x 1/2 x 300mm

what do each of these mesurements refer too ?
length 300mm I know

The BSP thread which is based on old style iron has a nominal ½" internal size so it tends to come up about ¾" external. I would be surprised if it is ¾" which comes up about 1" external. It is the pipe NOT the nut you measure.

The other 15mm refers to the copper tube that is now metric (used to be ½") that is outside dia but as the walls are so thin there is little difference outside to inside.

Very rough guide if your little pinky finger will not or only just fits in the BSP pipe it is ½" if it goes in easy it's ¾" don't get it stuck!

Unless you can post photos I can't see what more to suggest.

99% sure its a ½" x 15mm X 300mm as I said before, but if you are not sure buy them both and take one back. :D

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