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Converting to an offset mortgage is a possible solution. You keep the pile of cash but it effectively reduces the mortgage, but you keep the flexibility if you suddenly need access to cash (you can stick the emergency funds in there too).
Otherwise it depends on what your aims are.
Do you want to be a capitalist monster and maximise the return on the money for the sake of money, lifestyle improvements or early retirement?
Do you want to simplify your life (i.e. pay off a chunk/all of the mortgage)?
etc...
I thought my plan was very neat and sensible. Bit blindsided by suggestions that it may not be the right thing to do. Mind you, I’m very debt-averse and cautious so I suppose this isn’t a one-plan-fits-all kind of thing.