OK, that is helpful. Because if BA were unable to pay for something - and the most usual example is consequential losses such as a missed hotel night - then they would usually say so. Can you in some way reconcile what the £42 is for? It seems to me that either they have made a mistake or only processed one data upload or some such. In which case I would leave it a few days to see what actually gets paid and then if necessary revert and ask about the rest of the claim.