Apart from the bustard which is fenced off, the rest of the animals can wander around, and use the wooded areas. There are different sections but they can roam around as they please.
This is not the first drive through deer park in Norfolk. Park Farm at Snettisham (now called Snettisham Park https://www.snettishampark.co.uk/ ) has done this for decades. You can take rides through the deer, bottle feed the baby deer, and then buy your venison burgers in the cafe and venison to take home from the shop.