I had the exact same problem when I changed mine.
Everything seemed backwards, like facing outside and it was just impossible to disconnect the old taps from the copper pipe.
I have done taps and sinks before so it wasnt like I didn't know what I was doing.
But to cut a long story short, just do what someone above said, cut the copper pipe and attach push fit Flexi pipes, that is what I did.
Also I took all the waste pipe out so I had more room to get to everything, which will help it whatever you decide to try
Everything seemed backwards, like facing outside and it was just impossible to disconnect the old taps from the copper pipe.
I have done taps and sinks before so it wasnt like I didn't know what I was doing.
But to cut a long story short, just do what someone above said, cut the copper pipe and attach push fit Flexi pipes, that is what I did.
Also I took all the waste pipe out so I had more room to get to everything, which will help it whatever you decide to try
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