Do you have a protected no claims bonus? If it's not going to cause your premiums to take too big a hit, have it done as an insurance job.
Someone did more or less that, though not quite so deep and only at the rear, to my Peugeot about six months before I took the scrappage deal on it. With an 11 year old car it doesn't matter so much, and I just left it. If that happened to my Golf, I'd probably kill someone.
Rolfe.