You don't mention budget.
428i won't meet your need for cylinders - 4 pot.
The car jumping out at me that meets your criteria would be an M135i - 3 or (more likely) 5 door, right road tax category, 6 pot, a bit bigger than the MINI, etc. They've been around since 2012 so plenty of choice to match a range of budget. If you really need a coupe an M235i would just scrape in under the CO2 limit for €750 road tax.