No way is he going down. Not a chance. The rag hierarchy will pull out all the stops and he'll get a paltry fine of a couple of hundred pounds. They've got about six months to prepare a total blackening of the lady's name, half a year to twist everything into portraying her as a scheming gold-digger with a disreputable past, and make him into a brave and gallant hero who tried to pacify her, but when that failed and she resorted to violence he defended himself from the vicious assault, but in the process he accidentally kicked fuck out of her a dozen times.
If you're wealthy you can do whatever the fuck you want.