If you're within a decent period of retirement (10 years), I think the best thing to do is bury any overpay in to a SIPP, take the 20% uplift (tax rebate) and then pay off the mortgage with the 25% tax free drawdown. Ezy gainz.
I'm old, but not quite that old, yet.
Things to look forward to....
@SimonM started
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I'm old, but not quite that old, yet.