What you have to be aware of in the number crunching for the purposes of whether it is deemed BER or not, is that the costs for the engine damage will almost certainly be excluded.
Much the same as, if the engine in your car breaks down (say due to a piston failure or overheat causing the block to crack), and you coast to a halt at the side of the road, running off into a ditch, your insurers will not pay to fix your engine. Only the resultant damage to the car itself.
Therefore, without knowing the extent of damage to fuselage, pylon, wing etc. you can probably take off something in the region of US$10 to 20 million from the repair costs for the engine, which will be for BA's (or possibly GE's) account. My feeling, this bird will certainly not fly again....
Engines are often insured as well. It depends on magnitude of the damage and the causes. The large airlines absorb a larger risk themselves (FOD, etc.) but how much risk varies greatly.
I would be quite surprised in an event like this where the unexpected consequences went this far that the engine wasn't insured.