I don't think its a fair measure to consider the number of aircraft flights departing or cancelled. The important indicator is the number of booked passengers flown. With consolidation of flights on larger aircraft, it may well seem like there are less actual operations. Best wait until BA issues its customers flown analysis which has to be a fair reflection for fear of misleading markets.
This brings me on to an issue so many seem to have overlooked. The Union gloats about the number of services disrupted not caring that this equates to the plans and dreams of ordinary people destroyed. From the customers point of view, BA as a company appears to be doing all it can to maintain services or rebook customers on other airlines. On the other hand, the other party is trying to prevent them. Is it any wonder the Union lacks support from the public?