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Both of your old phones are built with the much more powerful MT6592 SoC. Anyway all other UMi phones with higher performance processors can playback 60fps videos but the GPU will downgrade them to 30fps in the background. The 30fps limit is stated by MediaTek itself, even in relation with their currently highest performance SoC. Link: https://www.mediatek.com/products/smartphones/mediatek-helio-x30
The London is UMi's cheapest and lowest performance model in the current portfolio, so it simply cannot be compared to a few years old flagship. The UMi Zero, UMi's 2014 flagship also can playback 60fps YouTube videos without any issue. Generally don't expect a phone with MT6580 to be able to play 60fps HD Youtube videos properly. It's just the low-end category.
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