If it's Mary Poppins, I don't think Disney would even ask the UK for money
why would they need to ask the country to fund any movie-based attractions when Disney owns the rights to that particular film? There's no significant risk to adding a family-friendly dark ride featuring what many consider Walt Disney's masterpiece to an area similar to Mary Poppins's set design.
Ratatouille in France and Mary Poppins in the UK could be greenlit pretty easily once their respective countries give TDO the all-clear. I don't think Disney would ask France or the UK to pay for those dark rides unless they're completely factual/serious.