Many business travellers, like myself, based in continental Europe now avoid using LHR for transit. I wasn't using LHR that much, maybe one transatlantic trip and four or five to central Asia. Those were all C class flights and that equates to at least €15,000. BA must be aware they are losing huge amounts of revenue because their home airport is managed by circus performers.
Most of that business has now gone to AF. Now CDG has never been the most efficient airport in the world but compared to the trapeze artists in LHR it's a bastion of organisation and efficiency.