BA have released a guideline for rebooking cancelled services onto QR services that are still operating:

Published today (30-Mar-2020) at 5:26pm

Advice for British Airways-125 ticketed customers whose BA flight is now CANCELLED

Rebook onto: Qatar Airways

Routes/Airports affected: Any cancelled British Airways service where QR also operate the route via DOH, e.g. SYD-LHR rebook onto SYD-DOH-LHR

Tickets issued by: 28 March 2020

Ticket travel dates: 29 March – 30 June 2020

New travel dates: Up to and including 30 June 2020

Rebooking Allowance on QR

Rebook onto Qatar Airways (QR) between the same point of origin and destination via Doha (DOH)

Rebook into the lowest available class in the same cabin

• Use the lowest class available
• If the same cabin is not available downgrade into lower cabin
• Do not involuntary upgrade
• For the Joint Business trunk route between DOH and LHR vice versa then rebook BA if operating

Available for Redemptions: No

Important Information

• Advise customers that schedules are subject to change at any time, we recommend they keep checking the operating carrier’s latest flight status and also add their contact details through the operating carriers Manage My Booking
• one ticket change allowed from the above options
• Includes any connecting BA/Joint Business services on the same ticket
• If changing both outbound and return sectors, travel must be completed by dates specified
• For rebook onto BA or refund options - Use standard Coronavirus guidance