Remove a stack that was leaking the customer had uesd other roofers to repair the leak. Stacks that are unused are best removed as it's impossible to keep the water from getting through as most stacks do not have a damp proof installed as the last photo shows.
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https://tamesideroofer.co.uk/index.php/recently-completed-repairs/item/17-chimney-repairs-and-remove#sigProId6a8f787b50
https://tamesideroofer.co.uk/index.php/recently-completed-repairs/item/17-chimney-repairs-and-remove#sigProId6a8f787b50