My flight to Pisa was cancelled today due to the IT chaos. I have managed to obtain a one way flight tomorrow with another airline as I did not want to risk a rebooking taking several days. I would welcome any advise on what next steps i should take/ compensation I should expect as i want to take my return flight with BA. My concern with asking for a refund is that i will not be able to take the return leg. Any advise would be gratefully recieved.