Having some years ago audited the GIB catering unit it is a surprise to me that it is still in operation as there are a number of companies on the rock including the bosses hotel that could meet the daily requirements. Any rumour about a take over seems illogical as the the only outcome with BA in charge is that we could turn GB into a loss making unit or pull out of the Iberias.
Though if you tie in the oft talked about amalgamation / buy out of Iberia/BA then it is not so illogical.