Mild hybrid - may get slightly improved fuel consumption, possible range of 1 or 2 miles on electric. Price is a material increase in complexity with limited environmental benefit.
A mild hybrid (MHEV) wont do any miles on electric. But there is no maybe about it, you will get slightly improved economy. Any environmental pro's and cons are irrelevant, because you don't have the option to choose between two (for example) 2021 Suzuki Swift's, one MHEV and one not. All Swifts from the 2020 facelift onwards are MHEV.
Plug in hybrid - likely cost more than a normal ICE + greater complexity. Whether this makes financial or environmental sense depends on (a) miles done on electric vs petrol, (b) ability to home charge and (c) price premium.
Plug in hybrid, as I said earlier, is pretty much a non starter because of the budget. But even if that wasn't a factor, there are very few smallish PHEV's anyway (nothing in the Polo/Fiesta size anyway, one or two in the next size category up), the figures just don't add up.
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