>>1770171Her Royal Majesty, The Queen.
I don't know if the other posters are being daft, but 'wilderness' is a legal term in the UK. It's land held by the Crown, that doesn't have a charter of incorporation, or the charter has been revoked (rare).
If a motorway or railway wants to build on, or cross wilderness, there's an approval process. The project has to form a Company, which petitions the Queen. If she approves the contract, she then appoints a steward, and work is scheduled.
Here's the snag: any further alterations (not in the contract) require HRM to issue a licence (properly, a 'licence patent'). But in general they haven't been issued since UK ACTS (the post 9-11 laws), and for anything under the purview of English Heritage they likely never will. For now, all crossings (including wildlife crossing) under this system have to simply reuse what's already been built.
Hope that clears things up.