In answer to a previous question, yes it was 27R, could that be why they seemed to be using 27L for the rest of the day (no change over at 3pm as normal. (May have been other reasons?)
As to which airline involved, I think nothing is gained by naming it.
Regardless of pilot skills, the fact is that if 23 was still available then the chances are this wouldn't have happened. As previously said, I'm sure the BAA wont pick up the repair bill, but I'm sure closing the runway has saved a few pounds...