Worth incurring early redemption penalty to pay off mortgage?

Currently have circa £125k outstanding on 4.9% fixed mortgage and circa 3 to go until 4% early redemption charge ceases to become payable. Can overpay 10% pa with no charge.
Will have sufficient spare funds soon to pay off mortgage.
Would seem to be beneficial to do this and incur early redemption charge rather than delay paying off for further 3 years given the relatively high interest rate versus what I could achieve for savings?
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