When some of the non M BMW cars are so good ( like your M135 )....is the actual proper M badge really necessary ? Certainly they all seem very tuneable very easily.

Autotrader search for estates sub 25k and over 350hp, auto, but less than £300 road tax brings up a load of Merc estates.

A lot of Volvo hybrids too, but fuck that shit if it goes wrong, although they do look good.

Although seems the search criteria hasn't gone exactly as requested, a few lower power cars too, and more than 25k etc. Some random ones

https://www.autotrader.co.uk/car-det...ted-product=HP

https://www.autotrader.co.uk/car-det...ted-product=HP

https://www.autotrader.co.uk/car-det...ted-product=HP

https://www.autotrader.co.uk/car-det...ted-product=HP

etc etc