a close to 17 year old well used 777, that is owned outright by the airline (so no lessor to pressure) with substantial heat damage, would not be close to economically repairable.
The engine alone is probably $20m for a suitable second hand example (although arguably the part that failed is not covered by insurance and there would be considerable betterment in a fresh out of check engine) the rest of the damage will mean BA is alas a 777 down in their fleet for some time.
There will however be a good amount of salvage, BA are likely to do a deal on that depending upon which interior this 777 has (update, it has an old interior so probably of little value to anyone), otherwise BA will see their money from insurers in the next week and the loss adjusters will go off and get offers for the remaining salvage.