Without wanting to upset the apple cart too much.
If BA do go down that line (90 days and a new contract) they would not, legally, be able to discriminate between staff on different T&Cs. So if they were looking at the last offer that non union staff accepted LGW would be looking at a huge pay increase (and a huge cost base increase) as would post '97 staff and as MF is up and running so would they.