tiny 4x4 estate manual 200bhp+

Yeah the OP's lack of budget doesn't help. At 5k+ the yeti. At 10k+ the mini.

But also the dimension of the car and boot size are vague!

Grafting an S1 engine and powertrain onto a Fabia body.

Indeed. The newer Suzuki S-Cross isn't that big either and can be had with the same 1.4 petrol turbo as the well regarded Swift Sport.

(Also the current Vitara is pretty small for an SUV)

Edit to Add: Both Suzukis are light so a chipped 170bhp from the boosterjet engine should give half decent performance.

+1
makes 220bhp+

AFAIK the 3.0 model weren't sold in the UK, so the handful that are for sale are petrol imports from Japan.