2 Part Mortgage. Which Part Do I Make Overpayments On??

Hi All, 
I have a 2 part mortgage both running for the same term but with different interest rates & amounts.
Part 1  £22350 - 2.09% fixed til Jan 2023.
Part 2  £30670 - 0.39% lifetime tracker. (BOE +0.29%)
I want to make an overpayment of £100 ever month but I don't know which part to pay it off?
As I want to decrease my term in the future. 
All advice is gratefully accepted & thank you in advance.

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