one very simple way to check is visiting the EU compensation claim part of the website, which will give you an instant answer as to whether or not the cancellation of your flight is eligible for a compensation payment:

ba.com/euclaim

If your flight was cancelled and you wish to proceed with a claim for compensation, you will need the following booking information:

Passenger names as displayed on the ticket
Your flight number
Scheduled flight departure date
Your booking reference


Cheers
Callum_1