Originally Posted by mario

There's a crucial point being missed here, grounded in passenger rights under UK law. While many are discussing BA's internal policies, the legally binding UK Regulation 261/2004 overrides these commercial considerations.

Under Article 8 of this regulation, passengers have the right to choose to be re-routed to their final destination at the "earliest opportunity" and under "comparable transport conditions."

The UK's Civil Aviation Authority (CAA) has clarified that this is not optional for the airline. Their guidance explicitly states that if an airline cannot re-route a passenger on its own services in a timely manner, it must rebook them on a rival carrier if seats are available. The argument that BA lacks a ticketing agreement with Emirates is legally irrelevant; that is an operational problem for the airline to solve, not a reason to deny your rights.

A structured way to handle it would be:
* State the Law: When speaking to the agent, if they refuse, calmly state that under Article 8 of UK 261, they are obligated to rebook you on the earliest available service, regardless of which airline operates it.
* Document Everything: If they still refuse, ask the agent to place a note in the booking confirming they are denying re-routing on an available same-day flight on another carrier. Note the agent's name, and the time and date of the call.
* Self-Purchase: You are then on strong ground to book the ticket yourself. Ensure it's for a comparable class of travel (e.g., another First Class ticket in this case) to avoid disputes over cost.
* Claim Reimbursement: Submit the receipt to BA Customer Relations for full reimbursement, clearly citing their failure to fulfill their duty of care under UK 261.

If BA refuses to pay, you can file a claim directly through Money Claim Online (MCOL). Given the clarity of the law and CAA guidance, your position would be very strong.

You need to consider your risk appetite and whether you're willing to front the cash and see the process through.