I agree with bravoecho. You need to explain clearly to BA what has happened. You posted a query on the BA board, but despite responding several times it wasn't clear at all whether you had planned to fly 4 BA sectors and ended up one short because of the cancellations, or whether you would never have had four BA sectors at all. I agree that if you would have had 4 BA sectors but for an involuntary reroute onto CX because of the August problems, there's a decent chance that BA will respond favourably to the request.