Jaguar essentially walked away from the mass-market sedan business and is now chasing the ultra-premium segment where they can charge serious money and compete with brands like Porsche and Bentley. That's the whole reason the Type 01 exists as a larger, more imposing vehicle.
The UK parking space issue is real, but it's just not a priority for them right now. When you're rebuilding a brand from scratch and betting everything on appeal to wealthy buyers in major global markets, you're not designing around average British high street parking. Those customers either have their own driveways, private parking, or they're not worrying much about where they fit the car anyway. It's a trade-off Jaguar made consciously - size and presence matter more for their positioning than squeezing into a standard UK bay.
That said, they'll probably still sell some in Britain to existing loyalists and wealthy buyers, but it's clearly not the market driving the design. The real question isn't whether they messed up the specs, it's whether they can actually pull off this repositioning and justify the premium pricing. The parking thing is just a side effect of chasing a totally different customer base than who'd buy a Jaguar ten years ago.