Best way to clear mortgage?

My balance is £51700
I have a rate of 2.64% which is fixed for another until January 2021
I have over paid by £4400 already this year and have a limit of £5700 over payment this year.
I Pay £271 a month for the mortgage and have an additional £850 (minimum) a month for overpayments and savings when I reach my overpayment limit.
I would like the mortgage to be gone in 49 months.
Nothing is paying well interest rate wise and a redemption figure is about £54k

Any ideas please on some strategies?
At the moment it is to save the £850 a month and pay that off on the first on January then chuck money into premium bonds before saving to overpay the maximum again each January.

Thanks in advance
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