Which mortgage to overpay?

Hello all, I currently have two mortgages; residential £134k (property value £350k) 2.18% (4 years left on fix) with 23 years remaining - currently overpaying by £100 a month. My second mortgage is a consent to let £74k (property value £170k) 2.5% variable. I am simply trying to find out mathematically which is the better to overpay, monthly or as a lump sum. My instinct says the one with the highest interest but I can't help think the one with the biggest debt as surly it accrues more interest ??!!??. I have tried to find an online calculator but to no avail so I thought i would ask my first world problems on the forum. Your help is much appreciated.

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