It does not change the fact that you'd still be likely to save more on budgeting larger for better snow preparation.
You're comparing the 'could cost' figure for the entire UK with the budget cost for a single highways agency, one that we don't even know will cope anyway.
The point is this doesn't happen very often. That overrides all other considerations.
If 500 UK cities (Isn't it for the entire Cumbria county, though? Might be wrong.) have the same budget you'd still only be at 2bn.
And my point is that even if it doesn't happen very often, it's the wrong mindset to have.
Nobody lives in Cumbria though, it's even less populous than Norway.