ShortfinalFred, you say of WW, "Can he close "exisiting" BA? Theoretically no because the size of the pension deficit, which he would have to make good on closure, dwarfs BA's reserves of cash to pay it."
On the one hand you say BA should make good and you'll strike if they don't. On the other you recognise that they can't make good.
Like the pension fund, something in your reasoning does not add up.